Drop the experience and support subpackages
    
    The only known user of the toolbox-experience and toolbox-support
    packages was: https://github.com/AICoE/tf-in-container
    
    ... which was declared dead in February 2022.
    
    Hence, there's no need to keep offering these subpackages.  Especially,
    since the cost of keeping them updated to match the content of the
    fedora-toolbox images is quite high.  If someone really needs these
    subpackages, then they can be reinstated.