Revert "Remove unused #list_remote_tags"
This reverts commit f5e87590 because #list_remote_tags is still used by EE:https://gitlab.com/gitlab-org/gitlab-ee/blob/2c364a79ee110a3adf49d6bd30be985ed13c3ec5/lib/gitlab/backend/shell.rb#L45.
/cc @razer6
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This reverts commit f5e87590 because #list_remote_tags is still used by EE:https://gitlab.com/gitlab-org/gitlab-ee/blob/2c364a79ee110a3adf49d6bd30be985ed13c3ec5/lib/gitlab/backend/shell.rb#L45.
/cc @razer6