Fixed slash commands not loading

## What does this MR do?

Fixes an issue with slash commands not working when the autocomplete source is loading & then the new issue button is clicked. This also fixes an issue where the autocomplete source is loaded on pages where it isn't actually needed.

## What are the relevant issue numbers?

Closes #21774, #21807

See merge request !6207

Fix issues with wrong issues/merge request counts when filters are selected

Closes #15356 plus counter for issues and MR are now displayed for the these paths `https://gitlab.com/groups/group-name/issues`  `https://gitlab.com/groups/group-name/merge_requests`  `https://gitlab.com/dashboard/issues` and  `https://gitlab.com/dashboard/merge_requests`

See merge request !4960

See gitlab-org/gitlab-ce!6247.

Add optional 'author' param when making commits

This fulfills https://gitlab.com/gitlab-org/gitlab-ce/issues/20789 by adding the ability to specify a user's ID to be used as the author of a commit.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/20789

See merge request !5822

Fix note form hint showing slash commands supported for commits

## What are the relevant issue numbers?

Closes #22218

See merge request !6368

Fix processing of events when build finished.

Update pipeline after processing builds. Otherwise we can get into scenario where pipeline will be marked as running.

This solves a quite significant regression in Pipeline processing.

Proper fix is to move all this to Sidekiq Worker and process pipeline there.
I'll do it after 8.12 release.

See merge request !6410

Render stages in valid order

Currently stages in stages dropdown on builds page are not in valid order. It is important to display stages in other those are defined in the pipeline.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21133

See merge request !6430

Lets the user choose a namespace and name on Github imports

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14971

See merge request !5728

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

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

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

Use a ConnectionPool for Rails.cache on Sidekiq servers

See merge request !6429

Frontend for Merge Request Diff

This merge request improves the UX for the merge request diff feature which was recently implemented here (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6127). Specifically, it styles various parts of the diff feature to match the designs, it disables comment-related buttons in states where comments are disabled, and it adds a 'Show latest version' button for convenience.

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

I could use feedback on this MR's fidelity to the design.  

## Why was this MR needed?

Neccessary styling improvements for basic UX of this feature, and enabled comment buttons are not functional and thus need to be disabled in certain states.

## Screenshots (if relevant)

![57dd0755f0b14342305909](/uploads/318a44a3bc8b7fc5c9c6ef92ba92e511/57dd0755f0b14342305909.gif)

## 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 [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 you do - 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-ce/issues/21427
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6127

cc: @jschatz1 

See merge request !6343

Fix "Unsubscribe" link in notification emails that is triggered by anti-virus

## What does this MR do?

* The unsubscribe link in an email body only unsubscribes automatically when logged in, otherwise the user is asked for a confirmation.
* The unsubscribe link in an email header unsubscribes automatically whether logged in or not.

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

This addresses all the comments from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5241, I think!

## Why was this MR needed?

People were getting unsubscribed automatically by AV software.

## Screenshot

![Screen_Shot_2016-09-20_at_09.51.30](/uploads/083ee2865f1ad6c08e2ed97f1c4e7d0d/Screen_Shot_2016-09-20_at_09.51.30.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry 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 you do - 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?

Fixes #17198.

See merge request !6223

Hide jump to next discussion button on commit notes

## What are the relevant issue numbers?

Closes #22354

See merge request !6428

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

Reduce duplication in AkismetService

See merge request !6362

Merge branch 'merge-request-push-compare-ui' of gitlab.com:gitlab-org/gitlab-ce into merge-request-push-compare-ui

LFS support for ssh enabled

## What does this MR do?
This is follow-up after https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6043 which is falsely shown as merged due to: https://gitlab.com/gitlab-org/gitlab-ce/issues/22334

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

## Why was this MR needed?

## Screenshots (if relevant)

## 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?

See merge request !6413

Closes #22354

- Fixed and added specs.
- Added different namespace options depending on user privilages
- Updated docs.

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

* Created a force=true param that will continue with the previous
  behaviour of the unsubscribe method
* Created a filter for not-logged users so they see a unsubsribe
  confirmation page
* Added the List-Unsubscribe header on emails so the email client can
  display it on top

Remove trailing spaces from messages in Gitlab::Regex

See merge request !6426

Fix broken spec due to last_activity_at updates being throttled

In https://gitlab.com/gitlab-org/gitlab-ce/builds/4218398, the build failed because the last_activity_at column was only being updated once per hour. We
can fix this spec by stubbing out the throttling and adjusting the spec to test the right event timestamp.

See merge request !6424