Validate with Git Hooks before accepting a merge request

We made possible to add some Git Hook based validation to things like commit message or commit author's email.

When we accept a merge request, it actually goes by the same validations an reject the merge if the merge commit does not follow Git Hook's predefined validations.

The problem is that it executes these validations when doing the very hard work of manipulating git repository, and cannot throw a usable and readable error to the user.

We are now executing these validations before scheduling git hard-work operations, and saving the error to display for the end-user.

Fixes #468, #305

See merge request !326

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Add some additional checking for LDAP DNs in Group Sync

Based on https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/335#note_4827853, check for `uid` specifically.

cc/ @jacobvosmaer 

See merge request !339

Merge branch 'fix/project-import_url' of gitlab.com:gitlab-org/gitlab-ce into ce_upstrem_import-url-fix

# Conflicts:
#	lib/gitlab/import_url.rb

Sync CE master to EE master



See merge request !342

In emails-on-push message, indicate message that individual file diff is too large

If a single file exceeded a diff limit, the previous implementation would just include the file as changed but the diff itself was not shown, leading to confusion:

![image](/uploads/18cd8e6b5c571305927097e1baf6097d/image.png)

Notice how the `nodes.pp` line shows no changes.

Diff overflow limits apply to different cases:

1. The entire diff exceeds 100 files OR 5000 lines
2. One single file exceeds 100 KB

Example case 2: Let's say we have a diff of 50 files, most of them under 100
KB, but one of them over that limit. In this case, the idea of
gitlab-org/gitlab-ce!2705 is that GitLab should show the diff of the 49 files
but omit the last one.

New screenshot:

![image](/uploads/9a0ac68e3deb08c28cab032fbbb80c9f/image.png)


See merge request !340

Fix required gitlab-shell version in the 8.5 to 8.6 update doc.

Make /profile/keys/new redirects to /profile/keys for back-compat

This addresses https://github.com/gitlabhq/gitlabhq/issues/10138.

See merge request !3717

Do not include award emojis in issue view comment_count

## What does this MR do?

Fixes Issue #14431, changing comment_count on issues index view to not include award emoji comments. While including them is technically correct, it feel nonintuitive in the way comments are presented.

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

No

## Why was this MR needed?

Improves UX of issues view

## What are the relevant issue numbers?

#14431

## Screenshots

### Before
 - ![Issues before](https://monosnap.com/file/cs7lcEkcChXXvAV22y2gh7gBFWCWjj.png)
 - ![MR before](https://monosnap.com/file/qzOawShznyXMKK3Z5cij4SKrHO4jNy.png)
### After
 - ![Issues after](https://monosnap.com/file/IWMedIiGnDnCly7zI5BwNTYQuCS8fH.png)
 - ![MR after](https://monosnap.com/file/mXJu1C2OVo5DGK0XdD67vPZGNPAw4L.png)


See merge request !3610

Report: https://github.com/gitlabhq/gitlabhq/issues/10138Signed-off-by: Rémy Coutable <remy@rymai.me>

Escape the query argument provided to `git grep` by `search_files`

Closes #14963.

See merge request !3633

Under the procedure, I've warned about gitlab-shell version, which should be 2.6.12 (may be some minor revisions introduces that).

Fix datetime format when migrating new notification settings on MySQL

Closes #15264 

See merge request !3733

Diff overflow limits apply to different cases:

1. The entire diff exceeds 100 files OR 5000 lines
2. One single file exceeds 100 KB

Example case 2: Let's say we have a diff of 50 files, most of them under 100
KB, but one of them over that limit. In this case, the idea of
gitlab-org/gitlab-ce!2705 is that GitLab should show the diff of the 49 files
but omit the last one.

change "very demand" to "specific demand" in CI runner docs

[ci skip]

See merge request !3726

Copying and pasting doesn't grab line numbers or +/-

Fixes #14176 

See merge request !3687

Geo: Use System Hooks for key synchronization

This MR changes from our custom notification solution to use system hooks instead for GitLab Geo (#76).
We had also to change the way we authenticate API requests for Geo. (See !334 for reference).

With new implementation, we create one system hook for every secondary Geo Node, and there will be a single endpoint that will receive all events (more to be migrated to System Hook).

See merge request !332

Add Sentry program context even without a current user



See merge request !3729

Remove deprecated NGINX CI config

[ci skip]

See merge request !3728

Emoji categories fix

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/14020

See merge request !3727

Fixes Issue #14431

Removed references to subscribe-button CSS class

These were being blocked by adblocks

Closes #15043

See merge request !3677

See merge request !331

Auto git fsck

Closes https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3232

See merge request !3232

Projects on group page should be sorted by last activity instead of id/created_at
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fixes #15237 

See merge request !3716