Drastically improve project search performance by no longer searching namespace name

Closes #40510 and #39623

See merge request gitlab-org/gitlab-ce!15590

Add a feedback mechanism to `package-qa` manual action

Closes #40431

See merge request gitlab-org/gitlab-ce!15538

Resolve "Update timeago.js"

Closes #40465

See merge request gitlab-org/gitlab-ce!15553

Fix WIP system note not being created

Closes #40374

See merge request gitlab-org/gitlab-ce!15528

Prevent 500 error when inspecting job after trigger was removed

Closes #36400

See merge request gitlab-org/gitlab-ce!15447

Add classList polyfill for IE classList.toggle('foo', force)

Closes #38916

See merge request gitlab-org/gitlab-ce!15552

Fix pulling and pushing using a personal access token with the sudo scope

Closes #40466

See merge request gitlab-org/gitlab-ce!15571

Update Prometheus Gem version and disable Prometheus method call instrumentation by default.

Closes gitlab-ee#4139 and #40457

See merge request gitlab-org/gitlab-ce!15558

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/38916

[ci skip]

Fix hashed storage for attachments bugs

Closes #40280

See merge request gitlab-org/gitlab-ce!15482

Clean up repository fetch and mirror methods

See merge request gitlab-org/gitlab-ce!15424

Fixed import of render mermaid & render math methods

See merge request gitlab-org/gitlab-ce!15550

Renamed ProtectedBranches::ApiUpdateService to LegacyApiUpdateService

See merge request gitlab-org/gitlab-ce!15575

Simplify the DB changes checklist

See merge request gitlab-org/gitlab-ce!15577

Move identical merged branch check to merged_branch_names

Closes #39887

See merge request gitlab-org/gitlab-ce!15464

Added Rubocop config for background migrations

See merge request gitlab-org/gitlab-ce!15576

Use foreign key to get latest MR diff

Closes #37631

See merge request gitlab-org/gitlab-ce!15126

Fix link text from group context

Closes gitlab-ee#4100

See merge request gitlab-org/gitlab-ce!15565

Allow password authentication to be disabled entirely

Closes #37320

See merge request gitlab-org/gitlab-ce!15223

This removes some somewhat redundant checkboxes from the template and
rephrases the introduction now that those settings are in GDK.

[ci skip]

This adds a Rubocop configuration file specific to
lib/gitlab/background_migrations. This configuration will be used to
(hopefully) make reviewing background migrations easier by enforcing
stricter rules compared to the rest of GitLab. Because this
configuration is directory specific it will only affect background
migrations.