This significantly improves performance when a user pushes many references.

project.path_locks.any? doesn't cache the output and runs `SELECT 1 AS one
FROM "path_locks" WHERE project_id = N` each time. When there are thousands
of refs being pushed, this can time out the unicorn worker.

CE port for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6159.

Remove top margin from checkboxes in integrations page

See merge request gitlab-org/gitlab-ce!19976

Resolve "BS4: Labels in issues system notes are misaligned again"

Closes #48072

See merge request gitlab-org/gitlab-ce!19972

Resolve "Use long sha version in MR widget copy to clipboard button"

Closes #48050

See merge request gitlab-org/gitlab-ce!19955

Buttons disappear on merge request page in some case

Closes #46861 and #14348

See merge request gitlab-org/gitlab-ce!19176

CE Backport: Add styles for persistent notice banner

See merge request gitlab-org/gitlab-ce!19968

Updates to `.po` & `.pot` linting

Closes #46096 et #39292

See merge request gitlab-org/gitlab-ce!18779

port 5956-auto-devops-multi-cluster-help-text to CE

See merge request gitlab-org/gitlab-ce!19680

Allow trailing whitespace on blockquote fence lines

See merge request gitlab-org/gitlab-ce!19960

Redirect favicon.(png|ico) to actual favicon asset or upload

Closes #47840

See merge request gitlab-org/gitlab-ce!19956

Update README.md to clarify EFS is slow and not to use this guide.

See merge request gitlab-org/gitlab-ce!19852

Rails5 fix db check: connection execute returns integer instead of string

See merge request gitlab-org/gitlab-ce!19901

Merge branch 'blackst0ne-rails5-invalid-single-table-inheritance-type-group-is-not-a-subclass-of-namespace' into 'master'

Resolve "[Rails5] Invalid single-table inheritance type: Group is not a subclass of Namespace"

Closes #48014

See merge request gitlab-org/gitlab-ce!19918

Rails5 fix passing Group objects array into for_projects_and_groups milestone scope

Closes #48012

See merge request gitlab-org/gitlab-ce!19920

Document Custom build directories

Closes gitlab-runner#2211

See merge request gitlab-org/gitlab-ce!19664

fixed broken link to git cheat sheet

See merge request gitlab-org/gitlab-ce!19879

Resolve "Creating a deploy token doesn't bring back to the creation page"

Closes #46429

See merge request gitlab-org/gitlab-ce!19639

Render calendar feed inline when accessed from GitLab

Closes #47672

See merge request gitlab-org/gitlab-ce!19698

Merge branch 'blackst0ne-rails5-expected-the-response-to-have-status-code-ok-but-it-was-404' into 'master'

Resolve "[Rails5] expected the response to have status code :ok but it was 404"

Closes #48008

See merge request gitlab-org/gitlab-ce!19937

Rails5 update Gemfile.rails5.lock

Closes #48009

See merge request gitlab-org/gitlab-ce!19921

Resolve "[Rails5] expected: "/search?search=seed_project" got: nil"

Closes #48013

See merge request gitlab-org/gitlab-ce!19936

[Rails5] Fix pipeline_schedules_controller_spec

Closes #48011

See merge request gitlab-org/gitlab-ce!19919

Expose a clean_backtrace method from Gitlab::Profiler

See merge request gitlab-org/gitlab-ce!19894

Rails5 fix update_attribute usage not causing a save

Closes #47960

See merge request gitlab-org/gitlab-ce!19881

[Rails5] Explicitly set request.format for blob_controller

Closes #47921

See merge request gitlab-org/gitlab-ce!19876

With text/calendar as Content-Type, the browser always downloads the
content as a file (even ignoring the Content-Disposition header). We
want to display the content inline when accessed from GitLab, similarly
to the RSS feed.

Resolve "Milestone not updating in MR sidebar after selection"

Closes #47933

See merge request gitlab-org/gitlab-ce!19870

Make Gitaly wiki RPC's mandatory

See merge request gitlab-org/gitlab-ce!19701

Fix queue_name in Rails 5

Closes #47372

See merge request gitlab-org/gitlab-ce!19874

Remove the ci_job_request_with_tags_matcher

See merge request gitlab-org/gitlab-ce!19947

Optimise paused runners

See merge request gitlab-org/gitlab-ce!19946