Extract strings to gettext

Closes #61960

See merge request gitlab-org/gitlab-ce!28489

There are no namespaces in the strings so we don't need those

Port of 61960-translatable-strings-in-issue-closure-emails to EE

Closes gitlab-ce#61960

See merge request gitlab-org/gitlab-ee!13219

There are no namespaces in the strings so we don't need those

Add index to count pending mirror updates

Closes gitlab-ce#62419

See merge request gitlab-org/gitlab-ee!13901

De-quarantine e2e test for issue suggestions

Closes gitlab-org/quality/staging#53

See merge request gitlab-org/gitlab-ce!29046

Add endpoint to regenerate feature flags client token

See merge request gitlab-org/gitlab-ee!13450

Request:
```
POST /*namespace_id/:project_id/-/feature_flags_client/reset_token
```

Response:
```
{
  "token" => "new-token-value"
}
```

Ignore Puma empty worker stats

See merge request gitlab-org/gitlab-ce!28932

In some cases (during worker start) it's possible that
Puma.stats returns an empty hash for worker's last status. In
that case we just skip sampling of the worker until these
stats are available.

Resolve "Docs feedback: unstage page needs clarification"

Closes #62618

See merge request gitlab-org/gitlab-ce!29113

Fixes some Phabricator import docs problems

See merge request gitlab-org/gitlab-ce!29114

Onboarding Welcome page: leverage onboarding utils and popover components

See merge request gitlab-org/gitlab-ee!13370

Make pipeline schedule worker resilient

Closes gitlab-com/gl-infra/production#805 and #61955

See merge request gitlab-org/gitlab-ce!28407

Add Dependency List table and row components

See merge request gitlab-org/gitlab-ee!13670

Resolve EE/CE differences in app/views/profiles/keys

See merge request gitlab-org/gitlab-ce!28900

Resolve EE differences in app/views/profiles/keys

Closes #6227 and #10506

See merge request gitlab-org/gitlab-ee!13575

Use global isSafeURL utility in safe_link component

See merge request gitlab-org/gitlab-ee!13926

Add expand/collapse button to operation settings

Closes #61511

See merge request gitlab-org/gitlab-ce!28840

Add ability to expand/collapse operation settings

Edited `Third Party Offers` for SSOT guidelines

See merge request gitlab-org/gitlab-ce!29103

Use rems instead of px to set body font-size

Closes #61640

See merge request gitlab-org/gitlab-ce!28544

Add documentation about AWS ELB not supporting web sockets

See merge request gitlab-org/gitlab-ce!28030

Add CI quickstart updates

See merge request gitlab-org/gitlab-ce!24702