Documentation mixed up 406 and 405 error codes, this corrects that

Also elaborated on the possible ways you can receive a 405 error code

See spec test: https://gitlab.com/powisj/gitlab-ce/blob/master/spec/requests/api/merge_requests_spec.rb#L848

Change dropdown divider color to gray-200 (#dfdfdf)

See merge request gitlab-org/gitlab-ce!23592

Add feature flag for workhorse content type calculation

See merge request gitlab-org/gitlab-ce!22667

Allow internal references to be removed

Closes #19376

See merge request gitlab-org/gitlab-ce!23189

[CE] Revert Gold Trial MRs

See merge request gitlab-org/gitlab-ce!23619

Fix gitlab:web_hook tasks

Closes #54975

See merge request gitlab-org/gitlab-ce!23635

[master]: Prevent a path traversal attack on global file templates

Closes #2745

See merge request gitlab/gitlabhq!2677

Introduce Knative Serverless Tab

See merge request gitlab-org/gitlab-ce!23617

Retry the review-{deploy,qa} jobs twice, and allow them to fail

Closes #54610 and #54717

See merge request gitlab-org/gitlab-ce!23510

Fixed renamed and mode changed diff viewers not rendering on merge requests

Closes #52607

See merge request gitlab-org/gitlab-ce!23600

Support unlimited file search in web UI and API

See merge request gitlab-org/gitlab-ce!23553

Sort issues and merge requests in ascending and descending order

Closes #39849

See merge request gitlab-org/gitlab-ce!21438

Update dependency scanning report fixtures

See merge request gitlab-org/gitlab-ce!23542

Add e2e test: push mirroring over HTTP

See merge request gitlab-org/gitlab-ce!23086

Expose merge request pipeline variables

See merge request gitlab-org/gitlab-ce!23398

Use approximate counts for big tables

Closes #51097

See merge request gitlab-org/gitlab-ce!23599

Gracefully handle unknown/invalid GPG keys

Closes #54729

See merge request gitlab-org/gitlab-ce!23492

Renders mode changed and renamed file merge request diff
viewers on the frontend.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/52607

Bump the gitaly version to 1.7.0

Closes #44431

See merge request gitlab-org/gitlab-ce!23616

Fixture for forks

See merge request gitlab-org/gitlab-ce!23613

This reverts commit 427c1e72, reversing
changes made to 5aac64a7.

Upgrade rspec-parameterized to 0.4.1

See merge request gitlab-org/gitlab-ce!23602

Changelog from gitaly:

** v1.7.0

**** Added
- Add an RPC that allows repository size to be reduced by bulk-removing internal references
  https://gitlab.com/gitlab-org/gitaly/merge_requests/990

** v1.6.0

**** Other
- Clean up invalid keep-around refs when performing housekeeping
  https://gitlab.com/gitlab-org/gitaly/merge_requests/992

** v1.5.0

**** Added
- Add tls configuration to gitaly golang server
  https://gitlab.com/gitlab-org/gitaly/merge_requests/932

**** Fixed
- Fix TLS client code on macOS
  https://gitlab.com/gitlab-org/gitaly/merge_requests/994

**** Other
- Update to latest goimports formatting
  https://gitlab.com/gitlab-org/gitaly/merge_requests/993

** v1.4.0

**** Added
- Link and Unlink RPCs
  https://gitlab.com/gitlab-org/gitaly/merge_requests/986

** v1.3.0

*** Other
- Remove unused bridge_exceptions method
  https://gitlab.com/gitlab-org/gitaly/merge_requests/987
- Clean up process documentation
  https://gitlab.com/gitlab-org/gitaly/merge_requests/984

Merge branch '51101-can-add-an-existing-group-member-into-a-group-project-with-new-permissions-but-permissions-are-not-overridden' into 'master'

Resolve "Can add an existing group member into a group project with new permissions but permissions are not overridden"

Closes #51101

See merge request gitlab-org/gitlab-ce!23226

Resolve "Can add an existing group member into a group project with new permissions but permissions are not overridden"

Introduce the following variables

- CI_MERGE_REQUEST_ID
- CI_MERGE_REQUEST_IID
- CI_MERGE_REQUEST_REF_PATH
- CI_MERGE_REQUEST_PROJECT_ID
- CI_MERGE_REQUEST_PROJECT_PATH
- CI_MERGE_REQUEST_PROJECT_URL
- CI_MERGE_REQUEST_TARGET_BRANCH_NAME
- CI_MERGE_REQUEST_SOURCE_PROJECT_ID
- CI_MERGE_REQUEST_SOURCE_PROJECT_PATH
- CI_MERGE_REQUEST_SOURCE_PROJECT_URL
- CI_MERGE_REQUEST_SOURCE_BRANCH_NAME

Forks influence the working of GitLab, and now getting in a fork is a
situation that's harder than it needs to be.

Resolve "Database schema diff 4 - (source) Missing partial index for ci_builds in the source (index_ci_builds_project_id_and_status_for_live_jobs_partial)"

Closes #53994

See merge request gitlab-org/gitlab-ce!23268

Remove close icon from projects dropdown in issue boards

See merge request gitlab-org/gitlab-ce!23567

Use partial index on `merge_request_id`

Closes #54913

See merge request gitlab-org/gitlab-ce!23609