This makes it possible to heavily optimize this migration, because we
need an outdated index to remove redundant stages faster.

* master: (441 commits)

Conflicts:
	db/schema.rb

Fix QA project clone wait condition

Closes gitlab-qa#175

See merge request gitlab-org/gitlab-ce!16932

31885 - Ability to transfer a single group to another group

Closes #31885

See merge request gitlab-org/gitlab-ce!16302

Added ldap config setting to lower case usernames

Closes #22607

See merge request gitlab-org/gitlab-ce!16791

Add feature highlight blue dot to GKE "Clusters" sidebar item

Closes #41672

See merge request gitlab-org/gitlab-ce!16379

The `has_css?` line was always timing out false because `$(‘…’).val(url)` does not change the input’s value attribute.

Include branch in mobile view for pipelines

Closes #42650

See merge request gitlab-org/gitlab-ce!16910

Handle EE edge cases in issues.closed_at migration

Closes gitlab-ee#4803

See merge request gitlab-org/gitlab-ce!16926

From https://gitlab.com/gitlab-org/gitlab-ce/issues/36760

Was reverted in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14373

Resolve "Different margins between buttons in tag list"

Closes #42584

See merge request gitlab-org/gitlab-ce!16927

Add missing foreign key and NOT NULL constraints to todos table.

Closes #32282

See merge request gitlab-org/gitlab-ce!16849

More conversions of $.ajax to axios

See merge request gitlab-org/gitlab-ce!16882

Allow moving wiki pages from the UI

Closes #37273

See merge request gitlab-org/gitlab-ce!16313

Resolve "`Set up CI` => `Set up CI/CD`"

Closes #42684

See merge request gitlab-org/gitlab-ce!16870

Encode GitalyClient::WikiPage attributes to UTF-8

See merge request gitlab-org/gitlab-ce!16925

Store uploader context in uploads

Closes #42547

See merge request gitlab-org/gitlab-ce!16779

Fixes #32282.

Replace $.ajax in preview markdown with axios

See merge request gitlab-org/gitlab-ce!16893

Replace $.ajax in admin broadcast messages with axios

See merge request gitlab-org/gitlab-ce!16840

Replace $.ajax in username validator with axios

See merge request gitlab-org/gitlab-ce!16892

Currently we still need to run EnsureStageService within a transaction,
because when it runs within in a transaction we are going to stick to
the primary database when using database load balancing. Extracting this
out of the transaction makes it possible to hit into problems with
replication lag in pipeline commit status API, which can cause a lot of
trouble.

Add backend for persistently dismissible callouts

See merge request gitlab-org/gitlab-ce!16735

EE seems to have had an outdated schema at some point, leading to some
environments not having the right columns in place. This adjusts the
migration for `issues.closed_at` so it takes care of those cases,
ensuring data can be migrated properly.

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/4803