Validate Geo queues exist before queue draining checks

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166795



Merged-by: Douglas Barbosa Alexandre <dbalexandre@gmail.com>
Approved-by: Sylvester Chin <schin@gitlab.com>
Approved-by: Douglas Barbosa Alexandre <dbalexandre@gmail.com>
Reviewed-by: Michael Kozono <mkozono@gitlab.com>
Co-authored-by: Mike Kozono <mkozono@gitlab.com>