17465 Fixed dropdown cursor key navigation

## What does this MR do?
This MR fixes the use of cursor/arrow/enter key events with search dropdowns, allowing a user to navigate up and down the list with the arrow keys and then select their item with the enter key.
It also applies some *minor* scroll user experience fixes, such as resetting the selected dropdown item every time it opens/closes (also stops multiple dropdowns conflicting) and forcing the dropdown scroll to scroll right to the top or bottom depending on whether they have selected the first or last item, respectively.

## Are there points in the code the reviewer needs to double check?
I would like someone with GitLab experience to check over whether this would harm any unique implementations of the GitLabDropdown or SearchAutocomplete.

## Why was this MR needed?
The current version has incorrectly behaving search dropdowns in the navbar, they either do not navigate using the keyboard or do not use the enter keystroke to select a highlighted item.

## What are the relevant issue numbers?
Fixes #17465.
Closes #20752.
Closes #21014.
**Contributes** to #20754.

## Screenshots (if relevant)
![17465.mp4](/uploads/1145abec226036abbaaa4aa46020f52b/17465.mp4)

See merge request !4781

Make all future skipped builds as processable when retrying a build

## What does this MR do?

Makes a builds that are marked as skipped when a pipeline is processed to be reprocessed by changing their's state to created.

## Why was this MR needed?

Currently retry is broken. When you retry a build of pipeline it will succeed and be marked as succeeded, when the next stages should be triggered.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21066

See merge request !5879

Merge branch '21010-emailsonpushworker-incorrectly-claims-deleted-a-commit-after-a-push' into 'master'

Resolve "EmailsOnPushWorker incorrectly claims deleted a commit after a push"

## What does this MR do?

Fix the comparison order in the emails on push worker, so regular pushes don't show a message about force pushing.

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

Don't think so, it was just a typo: `after_sha` should map to the `source_branch` argument, because it's the head of the comparison.

## Why was this MR needed?

To fix a regression!

## What are the relevant issue numbers?

Closes #21010.

## Does this MR meet the acceptance criteria?

- [x] ~~[CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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
  - [ ] 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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5894

Fix bug where notes weren’t shown in discussion when the code had changed after creation

See merge request !5908

Added text color to issues labels in issue board lists

## What does this MR do?

Adds the text color for labels in the response. The frontend was
already setup to handle this, just needed the data from the backend.

See merge request !5898

Do not escape URI when extracting path

## What does this MR do?

- remove escaping of URI parameters after they have already been unescaped in `ExtractsPath`
- remove spec that is relying on that behavior

## Why was this MR needed?

- spaces in directory names were escaped leading to 404 errors on repository files page

## What are the relevant issue numbers?

fixes gitlab-com/support-forum#952, #21106

See merge request !5878

Show wall-clock time when showing pipeline

## What does this MR do?

Show wall-clock time when showing pipeline instead of cumulative builds time.

Closes #17007

See merge request !5734

Improvements to issue boards on mobile

## What does this MR do?

- Removes the drag handles
- Adds a delay before dragging can start otherwise you can't scroll the page

See merge request !5897

Expiration date on memberships

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/17495

See merge request !5876

Ace ventura

## What does this MR do?

Makes Ace only load when it's actually necessary. The only two places it seems to be used is for Snippets and the File (Blob) Editor.

Before minification or compression, this takes the application.js down from 2.2MB to 1.6MB, and also removes two inline scripts :D

Compressed/Minified: master: 317KB/1.1MB, ace-ventura: 220KB/771KB

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

That this doesn't just completely break anything.

## Why was this MR needed?

Ace is a big library, this allows us to only load it when necessary.

## What are the relevant issue numbers?

#14372

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4914

Fix line commenting for the initial commit

## What does this MR do?

Support line positions on the initial commit, where we can't compare because there's no parent commit.

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

I chose to use the blank SHA to represent the initial commit, but it could as easily be the same SHA. I just thought this was clearer.

## Why was this MR needed?

People couldn't add line comments to the initial commit!

## What are the relevant issue numbers?

Closes #20895.

## Screenshots (if relevant)

![Comment_on_initial_commit](/uploads/1164448462ff55d133f3ff51c98044df/Comment_on_initial_commit.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added (N/A, regression)
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) (N/A)
- [x] API support added (N/A)
- 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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5900

* upstream/master: (50 commits)
  Increased vertical alignment of labels for issues in lists
  Changed file name Updated spec HAML
  Changed tests to use JS tests
  Addressed feedback
  Made logic simpler by moving away from underscorejs
  Added tooltip to label value in collapsed sidebar
  Add play icon SVG
  Have hover color of builds span full width
  Fix alignment of icon on commits page
  Change sleep to wait_for_ajax
  Added tests
  Destroy branch delete tooltip when row is removed
  Move and improvement comment in pipeline fixtures
  Fix notification_service argument error of declined invitation emails
  Update contribution acceptance criteria with tests requirements
  Fixed keyboard shortcuts not working on issue boards
  Hides tooltip when dragging Fixes issue with cursor not changing when dragging
  Hides tooltips when dragging issues
  Add a spec testing a second side effect of `Repository#merge`.
  drop execute bit
  ...

Add a spec testing a second side effect of `Repository#merge`.

## What are the relevant issue numbers?

- Closes #21081
- Related to gitlab-org/gitlab-ee!671
- Related to gitlab-org/gitlab-ee#900

See merge request !5886

Added tooltip to label value in collapsed sidebar

## What does this MR do?

Adds a list of the issuables labels to a tooltip in the collapsed
sidebar. Limited to 5 otherwise the list could get crazy long.

Closes #19398

See merge request !5232

Destroy branch delete tooltip when row is removed

## What does this MR do?

Destroys the tooltip when the branch row is deleted.

## What are the relevant issue numbers?

Closes #19528

See merge request !5120

Improve pipeline fixtures in development environment

### What does this MR do?

This MR adds further improvements to seeds for development environment:

* fixes build artifacts fixtures
* fixes build log fixtures
* moves unsuccessful jobs to the last triggered stage

See merge request !5838

Drop +x bit from .js and .css files

See merge request !5885

Increased vertical alignment of labels for issues in lists

## What does this MR do?

Increases the vertical alignment between labels on issues in issue boards lists.

## Screenshots (if relevant)

![Screen_Shot_2016-08-19_at_16.05.31](/uploads/4edc0fa520d1a0bf692d42d5f99ce4d7/Screen_Shot_2016-08-19_at_16.05.31.png)

See merge request !5902

The initial commit doesn't have a parent, so explicitly pass the blank
SHA and handle that when calculating the position.

Fixed keyboard shortcuts not working on issue boards

## What does this MR do?

Fixes keyboard shortcuts not working on issue boards page.

## What are the relevant issue numbers?

Closes #21071 

See merge request !5890

Add test requirement for new files

[ci skip]

See merge request !5813

Issue boards tooltip hide

## What does this MR do?

- Hides & disables tooltips when dragging issues or lists
- Fixes bug where cursor wouldn't change when dragging.

See merge request !5889

Render coverage badge using latest successful pipeline

## What does this MR do?

This MR make test coverage badge to report value for the latest successful pipeline, instead of the latest one, regardless the status.

Latest pipeline is often running, which makes coverage report inaccurate. Latest pipeline can be also the failed one, which may mean that not all stages got processed, therefore coverage report can be inaccurate as well.

This also improves coverage badge performance because it is not necessary to touch repository to get recent SHA on the branch.

## Why was this MR needed?

See #21013

## What are the relevant issue numbers?

Closes #21013

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- 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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5862

Pipelines ui updates

#### What does this MR do?
* Fixes hover color width on build list
* Fixes alignment of status icon on commits page
* Add play icon SVG

#### Why was this MR needed?
Small UI bugs with recent MRs

![Screen_Shot_2016-08-17_at_5.54.32_PM](/uploads/a5f1a38eac332865b17d8d74eeaa5142/Screen_Shot_2016-08-17_at_5.54.32_PM.png)
![Screen_Shot_2016-08-17_at_5.56.43_PM](/uploads/90608eee3e83dbe14244ff2be5a8867e/Screen_Shot_2016-08-17_at_5.56.43_PM.png)
![Screen_Shot_2016-08-18_at_9.18.37_AM](/uploads/9c1265fc3efa7b6084e2368d3fe458cd/Screen_Shot_2016-08-18_at_9.18.37_AM.png)

See merge request !5856

Fix small image previews in the file viewer.

## What does this MR do?

Fixes image previews being smaller than they should be.

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

I don't think so.

## Why was this MR needed?

Images were hard to view in the files view because they were limited to 50% of the file viewer's width.

## What are the relevant issue numbers?

Mentioned in https://gitlab.com/gitlab-org/gitlab-ce/issues/20505#note_13670085

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-08-08_at_10.35.40_AM](/uploads/69d885d1c8bb6296f5ac61aab4a4bf91/Screen_Shot_2016-08-08_at_10.35.40_AM.png)

After:

![Screen_Shot_2016-08-08_at_10.35.50_AM](/uploads/b78ed41a781228d9f170ed559a1fda25/Screen_Shot_2016-08-08_at_10.35.50_AM.png)

cc: @rymai 

See merge request !5721

Add boards controller to issue nav item

#### What does this MR do?
Adds active state to top level nav

Before: 
![Screen_Shot_2016-08-18_at_7.56.56_PM](/uploads/c5db0e9e077f0970b6b7b7d8d7a08147/Screen_Shot_2016-08-18_at_7.56.56_PM.png)

After:   
![Screen_Shot_2016-08-18_at_7.56.10_PM](/uploads/6b46e6f093c02fb44e25cf6952638a5b/Screen_Shot_2016-08-18_at_7.56.10_PM.png)


See merge request !5883

Add space under MR title

## What does this MR do?
Adds space underneath MR title because right now it's impossible to tell where the title ends and the first header of the MR body begins. 
Before:   
![Screen_Shot_2016-08-18_at_1.43.05_PM](/uploads/4e07892036b1d90217fdecbed31a9494/Screen_Shot_2016-08-18_at_1.43.05_PM.png)

After:    
![Screen_Shot_2016-08-18_at_1.42.22_PM](/uploads/1341d4d7c5bd0db21233f6ebb961bafc/Screen_Shot_2016-08-18_at_1.42.22_PM.png)


Note: We need to change our template to have the md headers `####` instead of `##`. Once that's been done it will look like this:
![Screen_Shot_2016-08-18_at_1.46.46_PM](/uploads/e30d432551debc15ec210e76dfcd3451/Screen_Shot_2016-08-18_at_1.46.46_PM.png)

See merge request !5875

Fix layout of edit tags page

#### What does this MR do?
Fixes layout of edit tags page

#### Why was this MR needed?
Layout was broken

#### Screenshots (if relevant)
Before:    
![Screen_Shot_2016-08-18_at_1.33.00_PM](/uploads/9e9e52bdc0743971d6e0996e2c2030a0/Screen_Shot_2016-08-18_at_1.33.00_PM.png)
After:    
![Screen_Shot_2016-08-18_at_1.32.08_PM](/uploads/0a4a93508f0c98cb0788a2c70ee33f4e/Screen_Shot_2016-08-18_at_1.32.08_PM.png)


See merge request !5874

Move to project dropdown with infinite scroll for better performance

## What does this MR do?

On the Move dropdown on the edit issue page we introduced infinite scrolling to just return a limited number of projects, 50 items. So if the user can move the issue to 50 or more items when scroll down on the list a new set of projects will be requested to the server.

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

## Why was this MR needed?

See #17932

## What are the relevant issue numbers?

Closes #17932

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [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
  - [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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5686

Load branch dropdowns asynchronously for cherry pick and revert dialogs

## Why was this MR needed and what does it do?

Previously every commit page was loading every branch onto the page twice, once each for the Cherry Pick and Revert modal dialogs. Most of the time they're never used, so that's a bit of a waste.

This loads them asynchronously by modifying the existing ref switcher code to also work for the branch selectors. This is better for performance.

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

Make sure Cherry Picking and Reverting still work (from my tests they seem to be fine).

## What are the relevant issue numbers?

Fixes #20108.

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-08-01_at_4.35.21_PM](/uploads/6b76ea656fd00df52ab56df5309976dc/Screen_Shot_2016-08-01_at_4.35.21_PM.png)

![Screen_Shot_2016-08-01_at_4.35.52_PM](/uploads/d2699a4bfc4ad1a4d414429e7c50e60f/Screen_Shot_2016-08-01_at_4.35.52_PM.png)

After:

![Screen_Shot_2016-08-01_at_4.32.49_PM](/uploads/5faa6494b10dd9ac5e8850763a0c4018/Screen_Shot_2016-08-01_at_4.32.49_PM.png)

![Screen_Shot_2016-08-01_at_4.32.56_PM](/uploads/87c490bb375244e7d72421fd55e13e3f/Screen_Shot_2016-08-01_at_4.32.56_PM.png)

![Screen_Shot_2016-08-01_at_4.33.02_PM](/uploads/59ae65c0afc39d8939a9f36431815854/Screen_Shot_2016-08-01_at_4.33.02_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [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
  - [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 you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

cc: @iamphill @jschatz1 

See merge request !5607