The GIN type of search (using `&&` operator) is very slow. It appears
that we might have a queries in range of 1-10ms if we use a dedicated
index that decomposes traversal_ids and perform prefix search in form of:

```sql
SELECT * FROM ci_namespace_mirrors
WHERE ((traversal_ids[1])) IN ((1)) OR (((traversal_ids[1]), ((traversal_ids[2])) IN ((1,2))
```

The 4-levels are used since this appears to be enough to cover 99% cases queried
by the index. Beyond 4th level it will be more efficient to do seq scan of remaining
entries.

Changelog: performance

Created ff for enabling namespace storage limit

See merge request gitlab-org/gitlab!82704

[Feature flag] Enable compliance violations report

See merge request gitlab-org/gitlab!83959

Resolve "ActionView::Template::Error: 4:Deadline Exceeded."

See merge request gitlab-org/gitlab!84269

Changelog: performance

Encapsulate checking for GraphQL error

See merge request gitlab-org/gitlab!84095

Track linked epics removed on usage data

See merge request gitlab-org/gitlab!83547

Remove import_project_from_remote_file feature flag

See merge request gitlab-org/gitlab!84266

Add FIPS support for API keys endpoint

See merge request gitlab-org/gitlab!82911

Log deprecated/unsupported report schema versions

See merge request gitlab-org/gitlab!84117

Log when a deprecated or unsupported report schema version is used by
the scanner.

Changelog: changed
EE: true

Update locked tooltip for project runners

See merge request gitlab-org/gitlab!84037

Track Zuora events from all components

See merge request gitlab-org/gitlab!84065

It improves observability of our payment processes

Record linked epic removed on usage ping
and use RedisHLL for data aggregation.

Changelog: added
EE: true

Clean up docs redirects - 2022-03-29

See merge request gitlab-org/gitlab!83832

Docs: Align tiering language for SAST, IaC, Secret Detection

See merge request gitlab-org/gitlab!84203

Clean up feature flag listings for two pages

See merge request gitlab-org/gitlab!84306

These two pages for Code Review had incomplete information about
the history of the feature flag. I dug up the history, and built out
the version history notes in the way our team expects.

Add Secondary Action to confirm_via_gl_modal

See merge request gitlab-org/gitlab!84267

Avoid milestone icon shrinking

See merge request gitlab-org/gitlab!84247

Check task with no-break space

See merge request gitlab-org/gitlab!80674

Fix RSpec/VariableDefinition rubocop offense

See merge request gitlab-org/gitlab!83956

Fix approver select debounce

See merge request gitlab-org/gitlab!84264

Resolve "Discussions on incidents should only display in the Summary tab"

See merge request gitlab-org/gitlab!81874

Add a RuboCop to prevent new not_owned endpoints

See merge request gitlab-org/gitlab!83958

Merge branch '325363-migrate-to-shared-alert-haml-partial-in-app-views-profiles-notifications-show-html-haml' into 'master'

Migrate alert to shared partial in profiles/notifications/show.html.haml

See merge request gitlab-org/gitlab!82693

Merge branch '355914-kubernetes-integration-with-eks-gives-no-feedback-on-cluster-status' into 'master'

Add deprecation notice to cluster creation and connection pages

See merge request gitlab-org/gitlab!83886

Fix GraphQL controller redirect when 2fa is required

See merge request gitlab-org/gitlab!84151

Add clipboard button to branch overview

See merge request gitlab-org/gitlab!80017

Update DAST Scanner Profile mutations to return complete profile

See merge request gitlab-org/gitlab!83383

  * Updates both Create & Update mutations

Changelog: changed
EE: true

Do not allow to change note's confidentiality

See merge request gitlab-org/gitlab!84174

Change the compliance dashboard to use the new compliance violations.
The violations provide a more granular report that also now allows us
to see every violation for every merged merge request in the group.
Not just the last merged merge request.

Changelog: changed
EE: true
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/83959

Set account string when 2fa creation fails

See merge request gitlab-org/gitlab!84082

As we already deprecated the certificate-based cluster connection,
we add a deprecation notice to cluster creation and connection pages.

Changelog: added

Merge branch '221045-markdown-textarea-footer-does-not-mention-that-quick-actions-are-supported-even-if-they-are' into 'master'

Show Quick Actions link when editing issue description and comments

See merge request gitlab-org/gitlab!83687