Require ansible-core or ansible on platforms that provide it
    
    ansible-core is now part of RHEL 8.6 and later.  If the user
    installs the system roles RPM, we should install the most
    appropriate version of ansible, which is ansible-core by default.
    This should also work in other cases where the user may have
    installed the `ansible` engine RPM - in that case, installing
    the system roles RPM should use the `ansible` already installed
    on the system.