[mailman3] Add fedmsg archiver
    
    Plenty of existing archived lists are reliable on fedmsg archiver. The EPEL9
    package is currently in bodhi
    https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2024-39533b3dcb. Let's add
    it to mailman3 role.
    
    Signed-off-by: Michal Konecny <mkonecny@redhat.com>