CE upstream - Monday

Closes gitlab-qa#149, gitaly#857, #3968, and gitlab-ce#41624

See merge request gitlab-org/gitlab-ee!3956

Merge branch '4506-spec-failure-in-spec-ee-spec-services-ee-projects-hashed_storage-migrate_repository_service_spec-rb' into 'master'

Resolve "Spec failure in spec/ee/spec/services/ee/projects/hashed_storage/migrate_repository_service_spec.rb"

Closes #4506

See merge request gitlab-org/gitlab-ee!3966

Make sure to change the DB cleaning strategy for Geo::BaseRegistry too in spec/services/groups/destroy_service_spec.rb
Signed-off-by: Rémy Coutable <remy@rymai.me>

`provider` is always required - remove confusing text

See merge request gitlab-org/gitlab-ee!3889

Running this after
spec/services/projects/hashed_storage/migrate_repository_service_spec.rb would fail
previously, because the new repository path already existed on disk. As this spec expects
the new repository path to not exist on disk prior to being moved, we should clear out
the test repos before running.

Recommend against the use of EFS

See merge request gitlab-org/gitlab-ee!3897

EE changes after moving fast authorized_keys feature to CE

See merge request gitlab-org/gitlab-ee!3959

The spec for "#add_key does nothing" would always have passed,
since the expectation was on both the wrong object and message.

# Conflicts:
#	lib/gitlab/exclusive_lease.rb

[ci skip]

Merge branch '40418-migrate-existing-data-from-kubernetesservice-to-clusters-platforms-kubernetes' into 'master'

Migrate existing data from KubernetesService to Clusters::Platforms::Kubernetes

Closes #40418

See merge request gitlab-org/gitlab-ce!15589

Geo admin screen enhancements

Closes #4268, #4179, and #1363

See merge request gitlab-org/gitlab-ee!3902

Upgrade scss-lint to 0.56.0

Closes #41754

See merge request gitlab-org/gitlab-ce!16278

Run background migrations with a minimum interval

Closes #41624

See merge request gitlab-org/gitlab-ce!16230

EE: Run background migrations with a minimum interval

Closes gitlab-ce#41624

See merge request gitlab-org/gitlab-ee!3933

Resolve "Allow QA tests to run with `CHROME_HEADLESS=false`"

Closes gitlab-qa#149

See merge request gitlab-org/gitlab-ce!16248