Stop using sidekiq-cron for scheduling all project mirror pull and move to adaptive scheduling

Closes gitlab-ce#29218

See merge request !1853

Implement server-wide Audit Logging admin screen

Closes #2336

See merge request !1852

Resolve "Approvers don't appear when MR is created from a fork"

Closes #2556

See merge request !2035

Remove references to old settings location

See merge request !2043

re-add avatar url to approver avatar

Closes #2560

See merge request !2034

The `users_select_tag` helper defaults to using `@project`, which in this case
is the source project, not the target project. Explicitly use the target project
to get the right list of users.

Per user/group access levels for Protected Tags

Closes #2132

See merge request !1629

Fix '/unassign' slash command

Closes #2470 and #2516

See merge request !1986

[EE] Enable the Style/PreferredHashMethods cop

See merge request !2023

Merge branch '2532-saving-a-mirrored-project-errors-out-if-mirror-user-has-been-deleted' into 'master'

Update mirror user for all projects deleted user is mirror_user for

Closes #2532

See merge request !2013

Add shared_runners_minutes_limit to groups and users API

See merge request !1942

Geo: use GeoNode#clone_url_prefix for the Geo::RepositorySyncService

See merge request !2028

Forbid Sidekiq scheduling in transactions [EE]

See merge request !2024

Feedback:
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1942#note_31511130

Clarify license should be uploaded to the primary Geo node

See merge request !1947

[ci skip]

Scheduling jobs in transactions can lead to race conditions where a job
runs before a transaction has been committed. The added initializer
ensures the various Sidekiq scheduling methods raise an error when
called inside a transaction.

Fixes #27233

made by the API. TODO: Need to do this for CE and all
the API tests as well

Backport gettext:compile Rake task to EE

See merge request !2022