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

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

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

Aligns the play button for stages

Closes #61469

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

Support Prometheus for group-level clusters (backend)

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

Tweak cluster helper and refactor its specs.

Move the build-qa-image to the test stage

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

CE destroy repo mirrors

Closes #54574

See merge request gitlab-org/gitlab-ce!27087

It is important to destroy data related to repo mirrors when they are
disabled.
Use `_destroy` nested attribute instead of `enabled` for push mirrors.
Call `remove_import_data` after saving a project if its pull mirror is
disabled.

CI variables of type file

Closes #46806

See merge request gitlab-org/gitlab-ce!27112

Add env_var and file as supported types for CI variables. Variables of
type file expose to users existing gitlab-runner behaviour - save
variable value into a temp file and set the path to this file in an ENV
var named after the variable key.

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/46806.

Fix uploading of LFS tracked file through UI

Closes #61203

See merge request gitlab-org/gitlab-ce!28052

[QA] Escape arg used as regex

Closes gitlab-org/quality/performance#2

See merge request gitlab-org/gitlab-ce!28104

Resolve "Reporters can create labels in projects/groups"

Closes #61222

See merge request gitlab-org/gitlab-ce!27991

Signed-off-by: Rémy Coutable <remy@rymai.me>

Merge branch '10090-move-ee-differences-for-app-assets-javascripts-pages-projects-issues-index-index-js' into 'master'

Resolved EE differences for issues page index

Closes gitlab-ee#10090

See merge request gitlab-org/gitlab-ce!28031

Remove cleaned up OIDs from database and cache

Closes #30093

See merge request gitlab-org/gitlab-ce!26555

CE Backport: Create ActiveRecordModel and table for Merge Train feature

See merge request gitlab-org/gitlab-ce!27879

Merge branch '58105-pipeline-author-and-commit-author-too-close-together-in-pipeline-list' into 'master'

Improve pipelines table spacing, add triggerer column

Closes #38802 and #58105

See merge request gitlab-org/gitlab-ce!26136

Add client methods for DisconnectGitAlternates rpc

See merge request gitlab-org/gitlab-ce!27938

Fix duplicate merge request pipelines created by Sidekiq worker retry

See merge request gitlab-org/gitlab-ce!26643