Allow unauthenticated access to Repositories Files API GET endpoints

See merge request !8149

Use gitlab-workhorse 1.2.1

More prometheus metrics, other small fixes.

See merge request !8197

hides new issue btn for not loggedin user

## What does this MR do?
This MR closes #25093 #25180
## Are there points in the code the reviewer needs to double check?
NR
## Why was this MR needed?
Prevent issue creation for no logged in user and some confusion related to 
## Screenshots (if relevant)

## 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] 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 #25093, #25180

See merge request !8175

Make 'unmarked as Work In Progress' system note more consistent

See merge request !8193

Memoize Milestoneish#issues_visible_to_user to reduce lookups

https://gitlab.com/gitlab-org/gitlab-ce/issues/25748

See merge request !8146

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Allow Repositories API GET endpoints to be requested anonymously

Closes #4269

See merge request !8148

Smarter refreshing of authorized projects

This MR reworks the way `User#refresh_authorized_projects`, resulting in a much more efficient process leading to fewer dead tuples.

Related issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/25257

See merge request !7956

Remove unnecessary method `build_user` from model `User` 

Closes #25678

See merge request !8162

Fix member with expiration date feature spec

See merge request !8186

Memoize Milestoneish#issues_visible_to_user and counts to reduce lookups
Milstoneish SQL optimised with project, but still slow on GlobalMilestone

Signed-off-by: Rémy Coutable <remy@rymai.me>

Move admin projects spinach tests to RSpec

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

See merge request !8174

Add doc for pipeline duration

The description was copied and modified from !6084

See merge request !6445

Add doc for the Gitea importer

This adds documentation for !8116. It's mostly a copy/paste of the GitHub import documentation without the OAuth parts since Gitea is not yet an OAuth provider.

Part of #22348.

See merge request !8139

It adds a brand new importer for Gitea!

This is a continuation of !6945 started by @bkc.

Gitea aims to be 100% GitHub-compatible but there's a few differences:

- Gitea is not an OAuth provider (yet): https://github.com/go-gitea/gitea/issues/27
  - This means we cannot map Gitea users given an assignee ID => assignees are not set on imported issues and merge requests
- No releases API for now: https://github.com/go-gitea/gitea/issues/330
- API version is `v1` (GitHub is `v3`)
- The IID field for milestones is `id` compared to `number` in GitHub.
- Issues, PRs, milestones, labels don't have a `url` field (the importer now fallback to `''` in that case)

**Known issues:**

- Comments are not imported because comments JSON always have a blank `html_url`/`issue_url`/`pull_request_url`, so the IID cannot be extracted and the issuable cannot be found... :( This is tracked in https://github.com/go-gitea/gitea/issues/401, and solved by https://github.com/gogits/gogs/pull/3624 but this needs to be submitted / merged in Gitea.

This is noted in the documentation.

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

1. I've made `Import::GiteaController` inherit from `Import::GithubController` since both controllers should be identical in the long-term and their current differences are small.
1. I've added a base `IssuableFormatter` class from which `IssueFormatter` & `PullRequestFormatter` inherit
1. I've added shared examples for GitHub/Gitea importer classes
1. I've made `Gitlab::ImportSources` more robust and tested! 🎄 
1. I've added routing specs for import routes! 🎄 

Closes #22348

See merge request !8116

Remove trailing whitespace when generating changelog entry

## What does this MR do?

It removes the trailing whitespace when a new changelog entry file is created by our changelog generator.

## Why was this MR needed?

If you run `bin/changelog` without passing merge request and author, these two lines are empty, with a trailing space at the end. I have to remove this trailing space manually.

See merge request !7948

Add online terminal support for Kubernetes

## What does this MR do?

Gives terminal access to kubernetes-deployed environments  via the deployment service

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

## Why was this MR needed?

Part of idea to production

## Screenshots (if relevant)

### `/root/reviewing/environments`

![Screen_Shot_2016-12-15_at_19.10.40](/uploads/bd2c54c07b6c85dec3328a20cd185b64/Screen_Shot_2016-12-15_at_19.10.40.png)

### `/root/reviewing/environments/10013`

![Screen_Shot_2016-12-19_at_12.52.39](/uploads/db4e4e06cda88437e8727433d65898b9/Screen_Shot_2016-12-19_at_12.52.39.png)

### `/root/reviewing/enviroments/10013/terminal`

![Screen_Shot_2016-12-15_at_02.35.52](/uploads/1bb77b7e2de2c657ae3bda62dc4f0970/Screen_Shot_2016-12-15_at_02.35.52.png)

## 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)
- 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 #22864 #22958
* Alternative to, and somewhat based on,  !6770 
* Depends on https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/83

See merge request !7690

Reject blank environment variables in Gitlab::Git::RevList

Closes #25848

See merge request !8189

Slack slash commands

## What does this MR do?

Implement Slack Slash Commands by utilizing generalized Mattermost presenter to fulfill Slack requirements.

## Why was this MR needed?

We want to expose Slack Slash Commands as a first-class service.

## What are the relevant issue numbers?

Supersedes !8007  
Closes #22182

See merge request !8126

Align milestone column header with count number

## What does this MR do?
- Aligns the milestone column header with the count number
- Prevents the count from wrapping below the column header

## Why was this MR needed?
- Count number was being pushed below the column header text if the text was too long

## Screenshots (if relevant)
- see issue sceenshots for before #25810 
- fixed version
![milestones](/uploads/ca12c290abe814b457ad3b2fb86f7696/milestones.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
- [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 #25810

See merge request !8177

Update font size of detail page header to 14px

Before:    
![Screen_Shot_2016-12-19_at_2.55.08_PM](/uploads/ff1544631ff376c3039674ac45eec696/Screen_Shot_2016-12-19_at_2.55.08_PM.png)
After:   
![Screen_Shot_2016-12-19_at_2.54.48_PM](/uploads/8a1038cc851e186eddada625b8c8de83/Screen_Shot_2016-12-19_at_2.54.48_PM.png)

Closes #25735

See merge request !8183

Remove inline-block styling from status

Before:   
![Screen_Shot_2016-12-19_at_2.13.42_PM](/uploads/2bb7bc84f97fb3489854518e35349203/Screen_Shot_2016-12-19_at_2.13.42_PM.png)
After:   
![Screen_Shot_2016-12-19_at_2.12.34_PM](/uploads/d228c105f90d546fce5b1653d7a74fd7/Screen_Shot_2016-12-19_at_2.12.34_PM.png)

See merge request !8181

Signed-off-by: Rémy Coutable <remy@rymai.me>

Give forbidden if project for the build was deleted

I guess we don't need a change log entry because this is just for an internal corner case fix.

Closes #25309

See merge request !8091

Fix Route#rename_children behavior

## What does this MR do?

Fix Route#rename_children behavior.
Given group `gitlab` and `gitlab-org` exists. When rename `gitlab` it
will rename `gitlab-org` group route too. This MR fixes it

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/2772

See merge request !8182

Even out padding on "plus" button in breadcrumb menu

Changed the padding on the ```+``` button to be ```6px``` on all sides.

![Screen_Shot_2016-12-16_at_8_06_07_PM](/uploads/cc85f8ff36c7d2dd75546a67445af19a/Screen_Shot_2016-12-16_at_8_06_07_PM.png)

Closes #25740

See merge request !8154

Add Wiki import to BB importer

## What does this MR do?

Adds wiki importing



- [ ] [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 https://gitlab.com/gitlab-org/gitlab-ce/issues/25819

See merge request !8180

Add LDAP maintenance task

I've received quite a few support requests where a user has renamed their LDAP server in the configuration file. This causes lots of issues where users are suddenly unable to sign in. It's easy enough to fix through the Rails console, but each time I had to instruct users how to get to the Rails console and what to type. This Rake task takes care of this and updates from old to new provider automatically.

Example: `sudo gitlab-rake gitlab:ldap:rename_provider[ldapmain,ldapcustom]`

cc/ @patricio @balameb Do you think this is useful?

See merge request !2181

Changed plus button padding to 6px 10px