Add Geo Prometheus metrics about the various number of events

Closes #4688

See merge request gitlab-org/gitlab-ee!4413

Add missing `stub_ee_application_settings` change to ES specs

See merge request gitlab-org/gitlab-ee!4431

Resolve "Specs in EE master fail with #show for image formats when requested file exists renders the raw file"

Closes #4846

See merge request gitlab-org/gitlab-ee!4430

Filtered search support for Epics list page

Closes #4656

See merge request gitlab-org/gitlab-ee!4223

20868 - Includes External Files in Gitlab CI YML

See merge request gitlab-org/gitlab-ee!4262

Geo - Ensure that upload deletions are communicated to the secondary

Closes #2103

See merge request gitlab-org/gitlab-ee!3635

Approve additionally

Closes #4134

See merge request gitlab-org/gitlab-ee!4033

Reset column information after the schema is migrated in MigrationsHelpers.schema_migrate_up!

Closes #4813

See merge request gitlab-org/gitlab-ee!4397

Clear the timeout in Jobs class after each test

See merge request gitlab-org/gitlab-ee!4424

Remove interchangiability test from http_io_spec

See merge request gitlab-org/gitlab-ee!4427

Override group sidebar links

See merge request gitlab-org/gitlab-ee!4234

Resolve "Measure multi-file editor usage on GitLab.com"

Closes #4547

See merge request gitlab-org/gitlab-ee!4226

Add metrics for:
 - Geo event log count
 - Geo event log max ID
 - Repository created max ID
 - Repository updated max ID
 - Repository deleted max ID
 - Repository renamed max ID
 - Repositories changed max ID
 - LFS object deleted max ID
 - Job artifact deleted max ID
 - Hashed storage migrated max ID
 - Hashed storage attachments max ID

It logs maximum IDs because Geo::PruneEventLogWorker might remove old
events, so COUNT isn't representing an accurate accumulate value for
the number of events created.

Closes gitlab-org/gitlab-ee#4688.

EE port: Translate issuable sidebar

See merge request gitlab-org/gitlab-ee!4221

Update docs labels

See merge request gitlab-org/gitlab-ee!4323

Implement LFS locking API

Closes #1830

See merge request gitlab-org/gitlab-ee!4091

Search API

Closes #2245

See merge request gitlab-org/gitlab-ee!4403