Make pipeline dropdowns consistent

See merge request !13530

Reduce duration and complexity of spec/features/issues/filtered_search/filter_issues_spec.rb

See merge request !13973

Optimize notification emails specs

See merge request !13986

Fixes the fly-out navigation flashing in & out

Closes #37022

See merge request !13929

The assignee wasn't important to the test, and shortening the query
allowed us to avoid the "horizontal scroll" failure without having to
stub the `sidebar_collapsed?` helper.

We now document that fact.

We were essentially testing "all of the filters" four times, so now we
just do it once at the top level.

Three issues were only used in one test each, and one milestone with its
accompanying issue were only used in one test, so we now scope those
locally.

Removes unnecessary `let!` usage since we explicitly access these in the
`before.

Re-uses `user2` as the author for issues we otherwise don't care about
the author for, to avoid creating a new user in each one.

Makes use of the `labeled_issue` factory to avoid assigning variables
just so we can add labels to an issue.

This seemed to only exist to increment an issue counter by 1.

Only one context tested group behavior, but we were performing group and
membership creation on every example unnecessarily.

While testing the various search tokens, we would add the token and a
search term, then verify the correct issues were returned. Then we'd add
a new token, search again, and verify again. Then another, and another.

This was entirely redundant. If the search with higher specificity
returned the same results as the search with lower specificity, we can
be sure the lower specificity searches also worked without actually
testing them.

Because this entire spec performs very extensive setup, it's important
to limit the number of times we perform that setup.

Validate PO files in static analysis

See merge request !13000

Add perforce migration doc

See merge request !13890

Simplify Git interactions in AfterImportService

See merge request !13962

Rollback changes made to signing_enabled.

Closes #37202

See merge request !13956

Changed message and title on the 404 page

See merge request !13982

Fixed group merge requests failure

See merge request !13985

Make member permission dropdowns consistent

See merge request !13600

Merge request to address /move functionality.

See merge request !13436

Use Gitaly 0.36.0

See merge request !13961

Backport to CE: Support `codequality` job name for Code Quality feature

See merge request !13833

Add 'from commit' information to cherry-picked commits

See merge request !13475

Unescape HTML characters in Wiki title

Closes #35686

See merge request !13942