workstation: Rely on comps for package selection
    
    Drop most package removals / additions from the kickstart file and rely
    on the @workstation-product comps group pulling in the correct packages.
    
    We'll need package selection done in comps in order to make Workstation
    netinstall work properly.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1134524