[Part 4] Add support for labels in Epic sidebar

See merge request gitlab-org/gitlab-ee!9315

Prevent unload when Recaptcha is open

Closes #44698

See merge request gitlab-org/gitlab-ce!24625

Update dependency @gitlab/ui to ^1.22.0

See merge request gitlab-org/gitlab-ce!24721

Wait for requests in specs before interacting with select2

Closes #56867

See merge request gitlab-org/gitlab-ce!24694

Adds labels picker within Sidebar.
Supports auto-expanding collapsed sidebar and reveal labels dropdown.

Bump Sidekiq to 5.2.5

See merge request gitlab-org/gitlab-ce!24662

Feature switch layer around Approvable and VisibleApprovable

See merge request gitlab-org/gitlab-ee!9147

Adds new and edit modules FF store

See merge request gitlab-org/gitlab-ee!9292

Fix `star` action in the `explore` subpages

See merge request gitlab-org/gitlab-ce!24693

[Part 3] Add support for start and due dates in Epic sidebar

See merge request gitlab-org/gitlab-ee!9304

To eager load rules, reuse the association without scope.
Filter those rules using `regular?` method.

as it is no longer needed.

Apply project scope

It is now wished for the feature to be disabled by default.
Since we can't control when the background migration finishes,
which would set the old flag to true,
changing the flag is easier to work around with.

From dev.gitlab repo

DRY maintainer

The logics are copied over but unchanged.

Similar to MergeRequestPresenter

Logic unchanged

Only call ApprovalState when enabled

Add query method for id

See merge request gitlab-org/gitlab-ce!24386

Standardize token value capitalization in filter bar

Closes #54213

See merge request gitlab-org/gitlab-ce!23846

Adds start and due date pickers within sidebar.
Supports for expand and collapsed sidebar states.

Fix create_edit_delete_epic_spec.rb test flakiness

Closes gitlab-org/quality/nightly#63

See merge request gitlab-org/gitlab-ee!9300

This reduces duplication caused by gitlab-monitor already shipping
Sidekiq 5.2.5. The only changes appear to be minor:

https://github.com/mperham/sidekiq/blob/master/Changes.md