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

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

* ee/master: (183 commits)
  Improve has_codeclimate_data? spec in the merge_request_spec.rb
  Refactor Elasticsearch checks to SystemCheck
  Refactor and move things around to improve in YAGNI perspective
  Fix BasicExecutor specs
  Changelog
  Fixed and improved some existing checks and SystemCheck library
  Fix codestyle
  Improve Specs and some fixes
  Add ActiveUsers Check
  Refactor gitlab:app:checks to use SystemCheck
  Added specs for BaseExecutor
  Added specs for SystemCheck and custom matcher
  Fix a few method signature checks
  Move rainbow monkey patch to String to spec_helper
  Some code-style fixes and documentation
  WIP SystemCheck library for executing checks from a rake task
  Persist Clone URL prefix in geo_nodes table to be used by the secondary
  Add small improvements to code climate ci docs
  Changelog
  Refactor codeclimate related code for build and pipeline
  ...

Compare codeclimate artifacts on the merge request page

See merge request !1984

Add new Rake task to simplify the compilation of PO files

See merge request !11864

Geo: store clone URLs in GeoNode for the GeoLogCursor replication

Closes #2536

See merge request !2015

SystemCheck library (EE part)

See merge request !2019

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>