Merge branch '37629-lazy-image-loading-breaks-notification-mails-for-an-added-screenshot' into 'master'

Resolve "Lazy image loading breaks notification mails for an added screenshot"

Closes #37629

See merge request !14161

Docs for automatically inherit the milestone and labels of the issue

See merge request !14223

Fix the Doorkeeper.optional_scopes issue triggered by !13314

Closes #37753

See merge request !14219

Allow all AutoDevOps banners to be disabled

Closes #37653

See merge request !14218

Add usage ping for Auto DevOps

Closes #37648

See merge request !14162

Add help text to runner edit page that tags should be separated by commas.

Closes #37405

See merge request !14224

Resolve "New issue from failed build no longer links to failed build"

Closes #36907

See merge request !13790

Resolve "Move `lib/ci` to `lib/gitlab/ci`"

Closes #5836

See merge request !14078

Remove db/migrate/20170828135939_migrate_user_external_mail_data.rb

See merge request !14240

Update mysql_to_postgresql.md to deprecate these docs in favor of PGLoader

See merge request !14238

This file is a duplicate of a post-deploy migration and appears to have
been left in by mistake.

Looping through the Users table in a foreground migration would've been
a bad idea.

[ci skip]

Resolve "Image onion skin + swipe does not work anymore"

Closes #37730 and #37732

See merge request !14215

fix CI

fix CI

Revert "Merge branch 'revert-f2421b2b' into 'master'"

See merge request !14190

Fix Auto DevOps quick start guide

Closes #37768

See merge request !14230

Decrease Perceived Complexity threshold to 15

See merge request !14160

Decrease Cyclomatic Complexity threshold to 13

See merge request !14152

Migrate Git::CommitStats to Gitaly

Closes gitaly#519

See merge request !14077

Add developer documentation about working with sent emails and previews

See merge request !14227

Resolve "Error 500 in non-UTF8 branch names"

This could potentially "duplicate" branches on the UI, but it prevents
500 errors. The real issue here is the fact that a branch name with a
invalid UTF-8 characters.

Closes #37025

See merge request !14090

Fixed the breadcrumbs project name not having hover style

Closes #37661

See merge request !14211

Detect orphaned repositories

See merge request !14204

Given the default in the development and production environment is
false, the negation of enabling is used in the flag to signal you'd turn
it off. It reads a bit awkward, but makes us have a migration less.

Fixes gitlab-org/gitlab-ce#37653