Backport of EE MR

See merge request gitlab-org/gitlab-ce!31903

Issue #39099: Add links for latest pipelines

Closes #50499

See merge request gitlab-org/gitlab-ce!20865

Make it clear that the artifacts count as uncompressed

See merge request gitlab-org/gitlab-ce!32045

Automated tests for issue boards

Closes gitlab-org/quality/testcases#83

See merge request gitlab-org/gitlab-ee!15237

Log time spent on CPU to sidekiq.log

Closes #65390

See merge request gitlab-org/gitlab-ce!31866

Avoid conflicts between ArchiveTracesCronWorker and ArchiveTraceWorker

See merge request gitlab-org/gitlab-ce!31376

Update dependency @gitlab/ui to v5.18.0

See merge request gitlab-org/gitlab-ce!31872

Resolve "Broken master due to `locale/gitlab.pot`"

Closes #13722

See merge request gitlab-org/gitlab-ee!15530

Add frozen_string_literal to ee/spec/controllers

See merge request gitlab-org/gitlab-ee!15518

Remove mergeTrain from FE since it's used only in EE

See merge request gitlab-org/gitlab-ce!32068

Send only necessary fields on mr-widget auto-refresh

See merge request gitlab-org/gitlab-ee!15495

Most of the fields are set on initialization on FE
Then we can just set them once and avoid sending
them on autorefresh

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

feat: smime signed notification emails

See merge request gitlab-org/gitlab-ce!30644

Adds new DB case study for namespaces statistics

See merge request gitlab-org/gitlab-ce!31547

Includes a new database case study about all the approaches taken to
store and update the namespace statistics in a performan manner
performant approach to store and update the namespaces statistics

Add docs exceptions to two pipeline jobs

See merge request gitlab-org/gitlab-ce!32082

Just leaving the campground cleaner than I found it.

The new resources are:
- board
- label board list
- milestone board list
- project milestone

Also, update issue resource to allow for the fabrication of issues
with milestones.

Improve doc about bridge job limitations

See merge request gitlab-org/gitlab-ce!32058

Using the sed script from
https://gitlab.com/gitlab-org/gitlab-ce/issues/59758

Remove unneeded check for merge_request.project

Closes #66368

See merge request gitlab-org/gitlab-ce!32086