Fix shorter route helpers in production environment

Closes #34741

See merge request !12675

Upgrade GitLab Workhorse to v2.3.0

See merge request !12676

Remove orphaned haml files

Closes #34779

See merge request !12690

Improve & fix the performance bar UI and behavior

Closes #33910, #33914, and #33909

See merge request !12361

Fix markdown preview tooltip cut off issue

Closes #31748

See merge request !12367

Add table for merge request commits

Closes #30224

See merge request !12527

Just draw :legacy_builds

Closes #34702

See merge request !12681

34727 Remove two columned layout from project member settings

Closes #34727

See merge request !12663

Resolve "`label` field for setting a chart's legend text is not working"

Closes #34655

See merge request !12628

This is an ID-less table with just three columns: an association to the merge
request diff the commit belongs to, the relative order of the commit within the
merge request diff, and the commit SHA itself.

Previously we stored much more information about the commits, so that we could
display them even when they were deleted from the repo. Since 8.0, we ensure
that those commits are kept around for as long as the target repo itself is, so
we don't need to duplicate that data in the database.

Limit the file tree view container width

Closes #34670

See merge request !12643

Add GitLab Runner Helm Chart documenation for custom certificates

See merge request !12594

Re-enable polling for environments

See merge request !12678

Backport Service changes from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2259

See merge request !12653

Cleanup minor UX issues in the performance dashboard

Closes #34653

See merge request !12635

Revert "Merge branch 'winh-mr-widget-no-pipeline' into 'master'"

See merge request !12674

Backports for ee-2112

Closes #34716

See merge request !12671

Add Traditional Chinese in Taiwan translations of Commits Page

See merge request !12407

Generate KUBECONFIG in KubernetesService#predefined_variables

Closes #33360

See merge request !12223

Fix `migration:path` build for "Honor the 'Remember me' parameter for OAuth-based login"

Closes #34713

See merge request !12668

Add foreign keys to various tables that point to the "projects" table

See merge request !9388

I don't know exactly when Rails picks each module to use, but this seems to be
used by `app` in the console (for instance, `app.project_path` would fail
before, but works now).

Update Prometheus Metrics Library

See merge request !12621

Fix stubbing attributes alongside cache_markdown_field

Closes #34698

See merge request !12661

This reverts merge request !12127

This cop has been renamed to ActiveRecordSerialize to match the way
"ActiveRecord" is usually written.

These IDs point to non-existing rows, causing the foreign key
constraints to fail.

This is allowed for existing instances so we don't end up 76 offenses
right away, but for new code one should _only_ use this if they _have_
to remove non database data. Even then it's usually better to do this in
a service class as this gives you more control over how to remove the
data (e.g. in bulk).

This removes the need for relying on Rails' "dependent" option for data
removal, which is _incredibly_ slow (even when using :delete_all) when
deleting large amounts of data. This also ensures data consistency is
enforced on DB level and not on application level (something Rails is
really bad at).

This commit also includes various migrations to add foreign keys to
tables that eventually point to "projects" to ensure no rows get
orphaned upon removing a project.