Container repository cleanup API

Closes #55978

See merge request gitlab-org/gitlab-ce!24303

Resolve "Milestone search"

Closes #54905

See merge request gitlab-org/gitlab-ce!24265

Adds steps for running GitLab Pages on a separate server

See merge request gitlab-org/gitlab-ce!24256

Cross-project pipeline triggers /CE

See merge request gitlab-org/gitlab-ce!24664

This includes a set of APIs to manipulate container registry.
This includes also an ability to delete tags based on requested
criteria, like keep-last-n, matching-name, older-than.

Convert note_actions_spec.js to Vue test utils

See merge request gitlab-org/gitlab-ce!24665

Linking to backup doc from migration doc, for self-hosted to self-hosted migration

Closes #56339

See merge request gitlab-org/gitlab-ce!24592

Reimplement Copy-as-GFM using the prosemirror document model

See merge request gitlab-org/gitlab-ce!22797

Use http_max_redirects opt to replace monkeypatch

Closes #54250

See merge request gitlab-org/gitlab-ce!24284

Fix empty labels for `pages:deploy` job

Closes #40997

See merge request gitlab-org/gitlab-ce!24451

Adds tracing support for ActiveRecord notifications

See merge request gitlab-org/gitlab-ce!24604

see https://github.com/vuejs/vue-test-utils/issues/631#issuecomment-421108344

Init GLForm instance on form while editing tags

Closes #56424

See merge request gitlab-org/gitlab-ce!24645

This commit segregates interface that is require to make CI/CD entity
processable, like `Ci::Build`. With this change it is not clear and
explicit what methods need to be implement to pass an object to pipeline
processing service.

Fixed diff tree folders being rendered incorrectly

See merge request gitlab-org/gitlab-ce!24635

We reuse this constant in EE.

Externalize strings from `/app/views/projects/ci`

See merge request gitlab-org/gitlab-ce!24617