Artifacts are in the middle of being migrated from ci_builds to
ci_job_artifacts. The expiration date is currently visible in both of
these tables and the test for whether an expired artifact is present
for a job is complex as it requires checking both the of the tables.

Add two new indexes, one on ci_builds.artifacts_expire_at and one on
ci_job_artifacts.expire_at to enable finding expired artifacts
efficiently.

And until the migration is finished, replace the SQL for finding
expired and non-expired artifacts with a hand-crafted UNION ALL based
query instead of using OR. This overcomes a database optimizer
limitation that prevents it from using these indexes.

When the migration is finished the next version should remove this
query and replace it with a much simpler query on just
ci_job_artifacts. See
https://gitlab.com/gitlab-org/gitlab-ce/issues/42561 for followup.

Resolve "Cancelling a second comment edit doesn't return its state to before the edit"

Closes #42462

See merge request gitlab-org/gitlab-ce!16869

Replace $.ajax in profile.js with axios

See merge request gitlab-org/gitlab-ce!16895

Update prometheus gem to version 0.9.1.pre.rc.2 fixing segfaults happening on metrics deletion

See merge request gitlab-org/gitlab-ce!16964

Replace $.get in diff file editor with axios

See merge request gitlab-org/gitlab-ce!16896

Cache Gitaly FindCommit RPC response

See merge request gitlab-org/gitlab-ce!16949

Remove duplicate calls of MergeRequest#can_be_reverted? on MR widget endpoint

See merge request gitlab-org/gitlab-ce!16975

Updating `HelpController` spec to use an existing image

See merge request gitlab-org/gitlab-ce!16977

CE Port: for Filtered search releated changes

See merge request gitlab-org/gitlab-ce!16917

Reset column information after the schema is migrated in MigrationsHelpers.schema_migrate_up!

Closes gitlab-ee#4813

See merge request gitlab-org/gitlab-ce!16950

Clear the timeout in Jobs class after each test

Closes #42830

See merge request gitlab-org/gitlab-ce!16969

Deploy prometheus through kubernetes and autoconnect to cluster

Closes #30480 and #28916

See merge request gitlab-org/gitlab-ce!16182

CE Port for Group Roadmap changes

See merge request gitlab-org/gitlab-ce!16908

Removing gitaly flags

See merge request gitlab-org/gitlab-ce!16953

[ci skip]

Don't use rugged in Repository#refs_hash

Closes gitaly#880

See merge request gitlab-org/gitlab-ce!16827

Translate issuable sidebar

Closes #34416

See merge request gitlab-org/gitlab-ce!16663

Backport LFS File Locking API

Closes #35856

See merge request gitlab-org/gitlab-ce!16935

Check for keep-around commits once if target and source projects are the same

Closes #37439 and gitaly#1000

See merge request gitlab-org/gitlab-ce!16972

Add how to get the external ip of a cluster

Closes #42691

See merge request gitlab-org/gitlab-ce!16874

Search API

Closes #41763

See merge request gitlab-org/gitlab-ce!16878

Fixes #37439
Fixes gitaly#1000

This reduces the number of RefExists RPC call.

The refs hash is used to determine what branches and tags have a commit
as head in the network graph. The previous implementation depended on
Rugged#references. The problem with this implementation was that it
depended on rugged, but also that it iterated over all references and
thus loading more data than needed if for example the project uses CI/CD
environments, Pipelines, or Merge Requests.

Given only refs are checked the network cares about the GraphHelper#refs
method has no need to reject those, simplifying the method.

Closes gitlab-org/gitaly#880