Adds support for launching Epic create UI through refactored Epic app.
Feature is currently behind same cookie flag
which is used for refactored Epic app.

[Part 6] Add support for Participants list and Subscription in Epic sidebar

See merge request gitlab-org/gitlab-ee!9329

Resolve "Redesign group overview UI: MVC"

Closes #53104

See merge request gitlab-org/gitlab-ce!23866

Use a Serializer for related issues/epics

Closes #8525

See merge request gitlab-org/gitlab-ee!9298

Convert noteable_discussion_spec.js to Vue test utils

See merge request gitlab-org/gitlab-ce!24765

Quarantine auto devops QA tests

See merge request gitlab-org/gitlab-ce!24786

Added missing parameter cluster_id in the params list for edit project cluster endpoint

See merge request gitlab-org/gitlab-ce!24731

Use serializers for:
- EpicLinks
- EpicIssueLinks
- IssueLinks

Docs: Minor fix to formatting

See merge request gitlab-org/gitlab-ce!24696

Add script to remove all subgroups within a provided group

See merge request gitlab-org/gitlab-ce!24593

Revert the "What's new" feature

See merge request gitlab-org/gitlab-ce!24772

EE Revert the "What's new" feature

See merge request gitlab-org/gitlab-ee!9339

Overrides commonName Helm chart value

Closes #55820

See merge request gitlab-org/gitlab-ce!24683

Resolve "Extract EE specific files/lines for some project CI views"

Closes #6102

See merge request gitlab-org/gitlab-ee!9342

Resolve "Extract EE specific files/lines for Platform app/models"

Closes #6678

See merge request gitlab-org/gitlab-ee!9341

Resolve "Extract EE specific files/lines for Platform app/workers"

Closes #6644

See merge request gitlab-org/gitlab-ee!9340

Port EE style for lib/gitlab/metrics/influx_db.rb

Closes gitlab-ee#6526

See merge request gitlab-org/gitlab-ce!24773

Resolve "Extract EE specific files/lines for some CI files"

See merge request gitlab-org/gitlab-ee!9333

Reduce amount of locks needed for GitHub importer

Closes #54270 and #51817

See merge request gitlab-org/gitlab-ce!24102

Add GitLab Pages predefined variables

See merge request gitlab-org/gitlab-ce!24504