Backport EE changes to group routes

Closes gitlab-ee#3794

See merge request gitlab-org/gitlab-ce!14973

Only cache the push event for the fork-source when it exists

Closes #39352

See merge request gitlab-org/gitlab-ce!14989

Fix escaped text replacement

Closes #37724

See merge request gitlab-org/gitlab-ce!14193

Create new branch from dropdown.

Closes #38485

See merge request gitlab-org/gitlab-ce!14714

Show Gitaly data in the peek performance bar

Closes #39231

See merge request gitlab-org/gitlab-ce!14949

Add loading button

See merge request gitlab-org/gitlab-ce!14883

Update using_docker_images.md

See merge request gitlab-org/gitlab-ce!14988

Remove Diff class from global namespace

See merge request gitlab-org/gitlab-ce!14965

Fix the broken .tests-metadata-state definition

Closes #39308

See merge request gitlab-org/gitlab-ce!14969

Fix deletion of container registry or images returning an error

Closes #39354

See merge request gitlab-org/gitlab-ce!14992

The fog-aliyun gem had a bug in v0.1.0 for file storage creation/update. This…

Closes #39126

See merge request gitlab-org/gitlab-ce!14991

Encompasses designs from
 - https://gitlab.com/gitlab-org/gitlab-ce/issues/23206#note_43355199
 - https://gitlab.com/gitlab-org/gitlab-ce/issues/29985#note_30417407

A successful DELETE call would result in a 204 No Content result,
which would have an empty response body. Don't automatically try
to parse this value as JSON both because there is no additional
information passed in the response body.

Closes #39354

The fog-aliyun gem had a bug in v0.1.0 for file storage creation/update. This merge requests update the gem to v0.2.0 which contains the fix:

https://github.com/fog/fog-aliyun/commit/a7456ca6b63e5a0d88c849914679d2fa4707c10c

Closes #39126

It is possible for a fork not to have a source anymore, in this case
we don't need to keep track of the push event.

Decrease ABC threshold to 54.28

See merge request gitlab-org/gitlab-ce!14920

Make sure we render events for projects within a group

Closes #39305

See merge request gitlab-org/gitlab-ce!14974

[ci skip]

Resolve "Remove help text regarding group issues on group issues page (and group merge requests page)"

Tip from
https://robots.thoughtbot.com/write-reliable-asynchronous-integration-tests-with-capybara#directly-interacting-with-javascript

New Crowdin translations

See merge request gitlab-org/gitlab-ee!3030