Fix help text in Admin Area > Background Jobs

See merge request gitlab-org/gitlab-ce!19208

Remove obsolete gitlab_shell checks

See merge request gitlab-org/gitlab-ce!22417

Adds back missing CI favicon

Closes #53888

See merge request gitlab-org/gitlab-ce!23002

Update haml_lint to 0.28.0

Closes #53289

See merge request gitlab-org/gitlab-ce!22660

Update ffaker to 2.10.0

Closes #53291

See merge request gitlab-org/gitlab-ce!22661

Relocate JSONWebToken::HMACToken from EE

See merge request gitlab-org/gitlab-ce!22906

Resolve "Docs update - adding project txt to match up with image"

Closes #53894

See merge request gitlab-org/gitlab-ce!23008

Improve the 'Testing levels' documentation

Closes gitlab-org/quality/team-tasks#24

See merge request gitlab-org/gitlab-ce!21505

Align all avatars and system notes in discussion

See merge request gitlab-org/gitlab-ce!22994

The CI favicon was missing in the jobs page.
This commit fixes it.

Closes #53888

Refactoring Issues::MoveService (port of promote epics)

See merge request gitlab-org/gitlab-ce!22766

Fix tags for environments

Closes gitlab-ee#8397

See merge request gitlab-org/gitlab-ce!22993

Make sure there's only one slash as path separator

Closes #53180

See merge request gitlab-org/gitlab-ce!22954

This reverts commit c739b8e0.

Fix MergeRequestService erroring out on deleted branch

Closes #53853

See merge request gitlab-org/gitlab-ce!22989

Disable CODEOWNERS for the time being

See merge request gitlab-org/gitlab-ce!22991

When a branch is deleted, the push commit IDs is an empty array.
The previous change would attempt to call `[].exists?`, which is
invalid. Fix this by returning `MergeRequestDiffCommit.none` instead.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53853

Removes feature flag for ciEnvironmentsStatusChanges

Closes #52937

See merge request gitlab-org/gitlab-ce!22947