Fix pushes to an empty repository not invalidating has_visible_content? cache

Closes #38646

See merge request gitlab-org/gitlab-ce!14613

Updates to Helm chart docs

Closes #38616

See merge request gitlab-org/gitlab-ce!14589

`Repository#has_visible_content?` used to rely on the cached count of local branches, but
since it is now an independently cached value it needs to be invalidated on its own.

Closes #38646

Add environment variable to bypass n+1

See merge request gitlab-org/gitlab-ce!14451

Fix Admin -> License selector for GitLab QA specs

Closes gitlab-qa#68

See merge request gitlab-org/gitlab-ce!14599

Add GitLab QA documentation

See merge request gitlab-org/gitlab-ce!14600

[ci skip]

remove period

See merge request gitlab-org/gitlab-ce!14598

Closes gitlab-qa#68

[skip ci]

Fix incorrectly aligned last updated time

Closes #38624

See merge request gitlab-org/gitlab-ce!14592

Create repositories via Gitaly

Closes gitaly#595

See merge request gitlab-org/gitlab-ce!14566

Add static analysis job to find invalid YAML in changelogs

See merge request gitlab-org/gitlab-ce!14518

Fix fork button being disabled for users who can fork to group

Closes #38462

See merge request gitlab-org/gitlab-ce!14551

Improves UX of autodevops popover to match gpg one

Closes #38582

See merge request gitlab-org/gitlab-ce!14582

Fixed anchored content not being scrolled into view

Closes #38326

See merge request gitlab-org/gitlab-ce!14562

All of these were in past releases, so missed their chance to be included in the
main changelog :-(

Changelogs without a .yml extension won't be picked up, and will be ignored
completely, so fail the pipeline when one of those is found.

Add translatable strings to wiki pages

See merge request gitlab-org/gitlab-ce!14534

Merge branch '36631-activerecord-statementinvalid-pg-querycanceled-error-canceling-statement-due-to-statement-timeout' into 'master'

Insert at most 1,000 rows at once in MR diff background migration

Closes #36631 et #37505

See merge request gitlab-org/gitlab-ce!13661

Updated All Navigation Icons to Sprite_Icons

See merge request gitlab-org/gitlab-ce!14559

Use backend-provided page title in repo editor

Closes #36029

See merge request gitlab-org/gitlab-ce!13763

Tell community members to ping PM when working on an issue

See merge request gitlab-org/gitlab-ce!14571

Make Repository#has_visible_content more efficient

See merge request gitlab-org/gitlab-ce!14554

Fix notes type created from import

Closes #38432

See merge request gitlab-org/gitlab-ce!14524

The first attempt didn't migrate all rows on GitLab.com, due to a couple of
issues:

1. Some rows in merge_request_diffs had truly huge numbers of commits and diffs
   serialised - one in particular had 26,000 commits!
2. The jobs were sometimes on Sidekiq hosts with frequent OOM errors, leading to
   the job being lost.

The previous commit adds more logging, and a more robust insertion method. This
commit reschedules the jobs, with a generous pause between each.

This version does not use transactions, but individual statements. As we have
unique constraints on the target tables for the inserts, we can just ignore
uniqueness violations there (as long as we always insert the same batch size, in
the same order).

This means the spec now must use truncation, not a transaction, as the
uniqueness violation means that the whole transaction for that spec would be
invalid, which isn't what we'd want. In real-world use, this isn't run in a
transaction anyway.

This commit also wraps unhandled exceptions, for easier finding in Sentry, and
logs with a consistent format, for easier searching.