Fix IID filter for merge requests and milestones

I updated the example in the docs and added a test. The milestones API was also broken for the same reason.

Related to !7358 and !7373

See merge request !7648

Fix Sidekiq stats in admin area

Closes #23825, #24675 

See merge request !7654

Fix exceptions when loading build trace

## What does this MR do?

This MR fixes exceptions when loading build trace.

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] Tests added for this feature/bug

## What are the relevant issue numbers?

Closes #24638

See merge request !7658

fixed bug to do with calculating durations

Fixes a couple of small bugs while calculating durations in cycle analytics - probably due to some bad refactoring

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/24796

See merge request !7663

Merge branch '24804-wrong-render-index-should-be-render-show-in-projects-pipelinessettingscontroller-update' into 'master'

Resolve "Wrong `render 'index'`, should be `render 'show'` in `Projects::PipelinesSettingsController#update`"

Closes #24804

See merge request !7665

changes environment.last_deployment to a try expression so it does not fail if e…

## What does this MR do?

Fixes the call on `environment.last_deployment` to not break when `environment`is not yet set.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #24779

See merge request !7671

Add changes to JIRA api docs

See merge request !7675

Fix spacing between icon and word in status badge

Before:      
![Screen_Shot_2016-11-22_at_11.44.16_AM](/uploads/65c5abc6dc08985cb3079b7c2af03715/Screen_Shot_2016-11-22_at_11.44.16_AM.png)
After:   
![Screen_Shot_2016-11-22_at_11.44.01_AM](/uploads/1b6261b64c65de5a718b68873e069ac9/Screen_Shot_2016-11-22_at_11.44.01_AM.png)

cc @dimitrieh

See merge request !7678

Sort pipeline graph builds and build groups by name

## What does this MR do?

Sorts builds and build groups by name within pipeline graphs

## Are there points in the code the reviewer needs to double check?

Shouldn't be. This was a one-line change.

## Why was this MR needed?

It can be difficult to find the build you are looking for within a group of similarly-named builds when they are in a seemingly random order.

## Screenshots (if relevant)

### Before:

![Screen_Shot_2016-11-22_at_2.48.11_PM](/uploads/27f3f9a2e29e7f0e5857bfd425b74306/Screen_Shot_2016-11-22_at_2.48.11_PM.png)

### After:

![Screen_Shot_2016-11-22_at_2.47.46_PM](/uploads/2c6ef1446a1de0012d091d6deef0992b/Screen_Shot_2016-11-22_at_2.47.46_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #24739

See merge request !7681

Fix cycle analytics plan stage when commits are missing

Takes into account when commits are `nil` so the app doesn't throw an exception and also removes them.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/24836

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !7694

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/24863

See merge request !7698

Fixed dragging issues on issue boards

## What does this MR do?

This fixes a few issues all at once:

- Fixes an issue when dragging an issue to a list but actually removes another issue from the original list
- Fixes an issue that caused the issue card to be appended to the bottom of the list
- Fixes an issue when dragging an issue would actually open up the sidebar

## What are the relevant issue numbers?

Closes #24654

See merge request !7701

Fix `LFS enabled` select box.

A refactor of the project edit page caused the `lfs_enabled` setting to be reverted to a non functioning state. This MR fixes that.

This will most likely need to be ported back to 8.13 and 8.14. 8.12 contained the correct code.

Fixes #24645 

Related commits:

- ea3bbbde
- da07c2e4

cc @stanhu @dblessing @dbalexandre @rymai

See merge request !7716

[ci skip]

See merge request !7676

See merge request !7672

Do not use MergeRequest#commits in define_pipelines_vars

## What does this MR do?

`MergeRequest#commits` requires merge_request_diff to be present.
This is not the case when creating a new merge request.

## What are the relevant issue numbers?

Fix up for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7568

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/24798

See merge request !7664

Preserve optional second parameter in NewNoteWorker jobs
    
Closes #24678

See merge request !7602

Handle orphans when removing soft deleted groups

This fixes the migration from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7528 so it handles orphans as mentioned in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7528/diffs#note_18800962.

This needs to go in 8.14.0 as otherwise customers may run into the same problem.

See merge request !7657

Add new image for Cycle Analytics

See merge request !7666

Docs on Mattermost commands

Still needs some screenshots, depends on: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7558

/cc @ayufan @SeanPackham

See merge request !7567

Add help section for MM commands

## What should this MR do

Check @pedroms' design for the Mattermost service screen: https://gitlab.com/gitlab-org/gitlab-ce/issues/22540

Now this has to be implemented, I've created a clean canvas for you, @lbennett, to draw on.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !7558

Revert "Merge branch 'docs/jira-old' into 'master'"

See merge request !7531

Improve readability of environments table

## What does this MR do?
Fix the environments table columns width

## Before
![Screen_Shot_2016-11-21_at_18.13.00](/uploads/1771b0546eb3cb15f4894b719fd44286/Screen_Shot_2016-11-21_at_18.13.00.png)

## After
![Screen_Shot_2016-11-21_at_18.11.18](/uploads/a20194a055b6ec0f7989f0c1499883d3/Screen_Shot_2016-11-21_at_18.11.18.png)
## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7628

Fix undefined error in CI linter

## What does this MR do?

This MR fixes undefined error in CI linter.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] Tests added for this feature/bug
  
## What are the relevant issue numbers?

Closes #24759

See merge request !7650

Backport SmartInterval, PrettyTime, SubbableResource from EE.

## What does this MR do?

Backports infrastructure used for EE-only Timetracking so it can be used and improved upon in CE. 

This doesn't really need review... it was already reviewed and merged in EE. 

There are no side effects or conflicts, just three new classes added:

1. `SubbableResource` -- pubsub for ajax resources
2. `SmartInterval`-- for configurable polling
3. `PrettyTime` -- time parsing and formatting utility methods

- [x] Added for this feature/bug
- [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/985

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/870

cc: @jschatz1

See merge request !7573

Restricted visibility buttons to checkboxes

## What does this MR do?

Changes the `Restricted visibility levels` settings to use checkboxes instead of a button group.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-11-14_at_19.25.48](/uploads/0c6ee415ee0c89c0a7e3ffd98f88df71/Screen_Shot_2016-11-14_at_19.25.48.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #18136

See merge request !7463

Issues empty state

## What does this MR do?

Adds the empty state for the project, dashboard and group issues.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

### Filtered to show no issues (on group issues page in this case but also dashboard and projects)

![Screen_Shot_2016-11-08_at_20.55.56](/uploads/b598af4a8a5e2c9fbb859abf36e70e4b/Screen_Shot_2016-11-08_at_20.55.56.png)

### Project with no issues

![Screen_Shot_2016-11-08_at_20.57.08](/uploads/8f54fdf1b3101c46299249fa2944207d/Screen_Shot_2016-11-08_at_20.57.08.png)

![Screen_Shot_2016-11-08_at_20.57.17](/uploads/1d2d162e1d845dd05e945d8ebb1d2101/Screen_Shot_2016-11-08_at_20.57.17.png)

### Group with no projects with any issues

![Screen_Shot_2016-11-08_at_20.54.55](/uploads/f28dc2038839d5bda0eb37f37927d5db/Screen_Shot_2016-11-08_at_20.54.55.png)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #20840 

Closes #20850

See merge request !7309

Make milestone page responsive

Credit to @yury-n for this one. ⭐ 🌟 ⭐  Original MR: !5255

## What does this MR do?

> Makes the milestone page more mobile friendly

## Are there points in the code the reviewer needs to double check?

> Shouldn't be but maybe double check that the views I changed are exclusively used by the milestone details page I was amending and not any other pages that I haven't tested after my changes.

Looks good to me. :) Would be awesome to have @annabeldunstone check up on the stylesheet updates.

## Why was this MR needed?

> Buttons were misaligned

> Progress bar was not 100% width

> Stats were cut in the middle

> Milestone name/date text overflow

![Screen_Shot_2016-07-14_at_5.37.49_PM](/uploads/4da67c9f81d71873188e4a5cafed8113/Screen_Shot_2016-07-14_at_5.37.49_PM.png)

![Screen_Shot_2016-07-14_at_5.41.58_PM](/uploads/b3d767ce49e37b251c3192ed051400b8/Screen_Shot_2016-07-14_at_5.41.58_PM.png)

![Screen_Shot_2016-07-14_at_5.46.41_PM](/uploads/353ad59a88f3dea9e3f88e6ea05c1af3/Screen_Shot_2016-07-14_at_5.46.41_PM.png)

## Screenshots (if relevant)

![Screen_Shot_2016-07-14_at_6.15.58_PM](/uploads/a26768701ea6cb00ccd85a5ac0772e36/Screen_Shot_2016-07-14_at_6.15.58_PM.png)

![Screen_Shot_2016-07-14_at_5.57.04_PM](/uploads/b94cf1b7593589948216342b48a19831/Screen_Shot_2016-07-14_at_5.57.04_PM.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #18852

See merge request !6655

Cycle analytics second iteration frontend

## Are there points in the code the reviewer needs to double check?
Mostly typos and code guidelines.

## Why was this MR needed?
This implements the frontend part of !6859 for #23449

## Screenshots

**Initial view**
![Screen_Shot_2016-11-21_at_5.28.43_PM](/uploads/ff9cfa9c9d6c2da28c24e03e384f89af/Screen_Shot_2016-11-21_at_5.28.43_PM.png)

**Cycle Analytics with data**
![Screen_Shot_2016-11-21_at_2.09.24_PM](/uploads/18d9786c090bdd554cf786c879543302/Screen_Shot_2016-11-21_at_2.09.24_PM.png)

**User doesn't have access for a stage**
![Screen_Shot_2016-11-21_at_2.11.01_PM](/uploads/d1ea76a63f2de2224954b5f40038c488/Screen_Shot_2016-11-21_at_2.11.01_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #23449

See merge request !7366

Improve deploy message

## What does this MR do?
Improves deploy message to make it more descriptive and useable then what is already offered by deploy command.

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7629

Resolve "Activity entries are not loaded fully to cover full window's height"

## What does this MR do?

Fixes a bug in which a browser window large enough to encompass the default number of items in an auto-loading endless-scroll list could not trigger the loading of additional items.

## Are there points in the code the reviewer needs to double check?

I refactored activities.js and pager.js into es6 syntax while I was investigating the issue.  No changes were made other than some es6 flourishes and eslint conformity, so nothing should be effected, but perhaps best to double check other pages which utilize these scripts.

## Screenshots (if relevant)

![endless-scroll-fixed](/uploads/b672b606826af745528c209ab6cfe95c/endless-scroll-fixed.gif)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #24499

See merge request !7608

explicitly disable eslint inline

## What does this MR do?

Explicitly disables eslint inline.

I.E. `/* eslint-disable */` => `/* eslint-disable max-len, no-new, ... */`

I used the script from https://gitlab.com/lbennett/eslint-dsblr.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

It will help refactor out eslint issues for older files.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7229

Fix errors happening when source branch of merge request is removed and then restored

See merge request !7568

Remove v-html

## What does this MR do?
Uses string interpolation instead of `v-html` to prevent xss attacks.

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7616

Adds a flag to reflect whether or not there is data in cycle analytics

See merge request !7622

Fix permissions error

## What does this MR do?
Gives the permissions to the child row in order to render it properly.

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7627

Send registry address with build payload

## What does this MR do?

Adds `registry_url` as a part of a build payload, when sending a response to a GitLab Runner which requested a new build.

## Are there points in the code the reviewer needs to double check?

Change in `lib/ci/api/entities.rb`.

## Why was this MR needed?

This is one of the steps needed to add support for private/protected registries hosted with GitLab CE/EE.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Related to gitlab-org/gitlab-ci-multi-runner#1828, gitlab-org/gitlab-ci-multi-runner!386, gitlab-org/gitlab-ci-multi-runner#1434

See merge request !7474