Try to simplify feature flag checks by using policies

There are two cluster hierarchies one for the deployment platform and
one for controllers. The main difference is that deployment platforms do
not check user permissions and only return the first match.

Instance level clusters were already mostly supported, this change adds
admin area controllers for cluster CRUD

Fix editing issues and MRs with NULL lock_version

See merge request gitlab-org/gitlab-ce!28145

Refactor and improve Geo::LogCursor and tests

Closes #11092

See merge request gitlab-org/gitlab-ee!12276

Merge branch '11505-broken-master-lint-duplicatemethods-method-clusterablepresenter-clusters_path-is-defined-at-both-app-presenters-clusterable_presenter-rb' into 'master'

Resolve "Broken master: Lint/DuplicateMethods: Method ClusterablePresenter#clusters_path is defined at both app/presenters/clusterable_presenter.rb"

Closes #11505

See merge request gitlab-org/gitlab-ee!12339

Upgrade GitLab UI to 3.10.0

See merge request gitlab-org/gitlab-ce!28140

Fix issuables state_id nil when importing projects from GitHub

Closes #57906

See merge request gitlab-org/gitlab-ce!28027

Issues and merge requests imported from GitHub are having state_id
set to null. This fixes the GitHub project importer and schedule
migrations to fix state_id.

Add close_select2 method to select2_helper

See merge request gitlab-org/gitlab-ce!27981

Fetch all available groups in MR approval rule form

Closes #11194

See merge request gitlab-org/gitlab-ee!12096

Add Mayra Cabrera to .gitlab/codeowners

See merge request gitlab-org/gitlab-ce!28131

Per the second step of:
https://gitlab.com/gitlab-com/www-gitlab-com/issues/3351

Update dependency @gitlab/svgs to ^1.60.0

See merge request gitlab-org/gitlab-ce!27842

Support creating a child epic from API

See merge request gitlab-org/gitlab-ee!11064

Aligns the play button for stages

Closes #61469

See merge request gitlab-org/gitlab-ce!28124

EE Backport: Support Prometheus for group-level clusters (backend)

See merge request gitlab-org/gitlab-ee!12115

Tweak cluster helper and refactor its specs.

It also make it more efficient

Support Prometheus for group-level clusters (backend)

See merge request gitlab-org/gitlab-ce!27995

Tweak cluster helper and refactor its specs.

- move code checking if epics can be linked
  from EpicLinks::CreateService to Epic model

Improve scheduling of mirror updates to reduce frequency of database queries

See merge request gitlab-org/gitlab-ee!11217

Move code from EpicsHelper to a presenter

Closes #8948

See merge request gitlab-org/gitlab-ee!10849

**Note:**
- It resolves this by passing `all_available` to the groups request
- Also adds feature spec

Move the build-qa-image to the test stage

See merge request gitlab-org/gitlab-ce!28122

**Why?**
This is needed to create a feature test for:
https://gitlab.com/gitlab-org/gitlab-ee/issues/11194

This adds rescheduling logic to the end of UpdateAllMirrorsWorker job.
We wait for a few seconds before we check capacity again and - if some
jobs already completed - we schedule another run of
UpdateAllMirrorsWorker.