Ensure python3-dnf is installed on Fedora 41+ hosts
    
    dnf5 requires neither python3-rpm nor python3-dnf, so we cannot
    assume they are installed (as they always were before). ansible's
    package_facts needs python3-rpm (even in the latest upstream
    version), so we at least need that. The ansible in rhel9 (which
    is what's on batcave01 currently) does not support dnf5 at all,
    so we need python3-dnf installed so it can use its dnf3/4
    support. python3-dnf relies on python3-rpm, so we can just
    check for and install python3-dnf. Once batcave01 is updated to
    an ansible that supports dnf5 we won't need python3-dnf, but we
    *will* still need python3-rpm.
    
    Stuffing this in yumrepos.yml as it runs on everything, early,
    and is packaging-related. We could make it a separate task but
    then we'd need to make every playbook include it...
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>