greenwave: enable Rawhide gating on openQA update tests
    
    As per https://pagure.io/fesco/issue/3011 and
    https://lists.fedoraproject.org/archives/list/devel-announce@lists.fedoraproject.org/message/G2K2SMYN7ONOJEFQEMCDR7GK72MZQFYB/
    this enables gating of Rawhide updates on the same set of tests
    used to gate stable and Branched updates.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>