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.

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.

The `Gitlab::Mirror.reschedule_immediately?` performs a rather heavy
query and it was detected that this is the major contributor to total
query time on GitLab.com (50% of total time is spent in this query!).

Context: https://gitlab.com/gitlab-org/gitlab-ce/issues/60524

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.

EE destroy repo mirrors

Closes gitlab-ce#54574

See merge request gitlab-org/gitlab-ee!10355

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.

Add some missing strings to locale/gitlab.pot

See merge request gitlab-org/gitlab-ee!12310

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.

Port of 46806-typed-ci-variables to EE

See merge request gitlab-org/gitlab-ee!12280