Handle EE edge cases in issues.closed_at migration

Closes gitlab-ee#4803

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

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

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EE seems to have had an outdated schema at some point, leading to some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

Enable Prometheus metrics for deployed Ingresses

Closes #39985

See merge request gitlab-org/gitlab-ce!16866

Adapt config to support Prometheus 2.1

Closes #42496 and #42498

See merge request gitlab-org/gitlab-ce!16749

Fix export removal for hashed-storage projects within a renamed or deleted namespace

Closes #42270

See merge request gitlab-org/gitlab-ce!16658

Make find_user_from_sources extensible for EE

See merge request gitlab-org/gitlab-ce!16924

Bypass markdown for commit titles on MR notes

Closes #37616

See merge request gitlab-org/gitlab-ce!16883

Incorporate OperationService.UserSquash Gitaly RPC

Closes gitaly#991

See merge request gitlab-org/gitlab-ce!16899

Fix flay not detecting identical code

Closes #42628

See merge request gitlab-org/gitlab-ce!16828

Backport /api/v4/groups N+1 query check from EE

See merge request gitlab-org/gitlab-ce!16913

Change SAST confidence level in .gitlab-ci.yml

See merge request gitlab-org/gitlab-ce!16831

Track and act upon the number of executed SQL queries

See merge request gitlab-org/gitlab-ce!16466