For getting the SHAs from an MR to find pipelines, we get the last 100 MR diffs
for the MR, and find commits from those. This was un-indexed before, because the
index was not a composite index on merge_request_diff_id, id. Changing that
means that this scope can exclusively use indexes.

The st_commits and st_diffs columns on merge_request_diffs historically held the
YAML-serialised data for a merge request diff, in a variety of formats.

Since 9.5, these have been migrated in the background to two new tables:
merge_request_diff_commits and merge_request_diff_files. That has the advantage
that we can actually query the data (for instance, to find out how many commits
we've stored), and that it can't be in a variety of formats, but must match the
new schema.

This is the final step of that journey, where we drop those columns and remove
all references to them. This is a breaking change to the importer, because we
can no longer import diffs created in the old format, and we cannot guarantee
the export will be in the new format unless it was generated after this commit.

Sidekiq has to be running too.

Add controller#action metrics on Gitaly

See merge request gitlab-org/gitlab-ce!15244

At this time we had good metrics on what number or requests each GRPC
received, but were in the dark what controller#action combination was
responsable. Or if Sidekiq was responsable. Now added are call counts
per service and rpc matched with controller#action combinations.

Fix defaults for MR states and merge statuses

Closes #40534

See merge request gitlab-org/gitlab-ce!15594

Hashed storage attachments migration path

See merge request gitlab-org/gitlab-ce!15352

Strip leading & trailing whitespaces in CI/CD secret variable keys

See merge request gitlab-org/gitlab-ce!15615

Upgrade codeclimate image to latest

Closes #40255

See merge request gitlab-org/gitlab-ce!15461

Add new API endpoint - list jobs of a specified runner

Closes #39699

See merge request gitlab-org/gitlab-ce!15432

limit icon component size to valid values

See merge request gitlab-org/gitlab-ce!15618

Upgrade seed-fu to 2.3.7

Closes #40568

See merge request gitlab-org/gitlab-ce!15607

Add new API endpoint - get a namespace by ID

Closes #40254

See merge request gitlab-org/gitlab-ce!15442

Refactor the way we pass `old associations` to issuable's update services

Closes #40226

See merge request gitlab-org/gitlab-ce!15542

This commit also makes spec/policies/namespace_policy_spec.rb file
to be compatible with the same file in GitLab EE.

Backport disable autocomplete

See merge request gitlab-org/gitlab-ce!15557

Update prometheus gem to fix build on RPi

Closes omnibus-gitlab#2988

See merge request gitlab-org/gitlab-ce!15616

Backport epic fullscreen

See merge request gitlab-org/gitlab-ce!15437

Backport of add-epic-sidebar

See merge request gitlab-org/gitlab-ce!15335

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

Create issue and merge request destroy services

Closes #39601

See merge request gitlab-org/gitlab-ce!15604

Add in the Oxford comma

See merge request gitlab-org/gitlab-ce!15602

Fix 404 on commits list for branch that doesn't have any files

See merge request gitlab-org/gitlab-ce!15603

Optimise StuckCiJobsWorker

Closes gitlab-com/infrastructure#3260

See merge request gitlab-org/gitlab-ce!15527