Temporarily drop gnome-boxes from Workstation due to ceph FTI
    
    https://pagure.io/releng/failed-composes/issue/3739#comment-807000
    Boxes currently fails to install because ceph failed to build
    against fmt 9. As long as Boxes is in Workstation, this will
    cause Rawhide composes to fail. Since it's already not working
    due to https://bugzilla.redhat.com/show_bug.cgi?id=2105116 ,
    let's just drop it from Workstation till the ceph/fmt thing is
    worked out.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>