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

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

Added documentation for uploads object storage support

See merge request gitlab-org/gitlab-ee!4412

Converted EE protected tags & branches to axios

See merge request gitlab-org/gitlab-ee!4421

* N+1 queries were fixed for LFS File Locking operations
* Small update for docs

Build was failing with: Mysql2::Error: Cannot drop index 'index_lfs_file_locks_on_project_id_and_path':
needed in a foreign key constraint: DROP INDEX `index_lfs_file_locks_on_project_id_and_path` ON `lfs_file_locks`

More details on https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/49848260

Plus small update for LfsLocksApiController

- Added new compound unique key for lfs_file_locks
- Improved uniqueness validation for creation of locks.
- Added authorization checks for Lock and Unlock services
- Improve description in controler specs

Some migration of code from EE was required given it was not possible to
validate the `Commit` object from CE.

All the endpoints required for Git LFS 2.3.4 have been implemented,
for more info please visit: https://github.com/git-lfs/git-lfs/blob/v2.3.4/docs/api/locking.md

Pagination has not been added given it's optional and Kaminari doesn't
support cursor based pagination yet.