Ticket 49446 - Add CI test case
    
    Description: Add a test case to suites/replication/regression_test.py
    Test that cleanallruv could not break replication if startCsn originated
    from deleted replica
    
    https://pagure.io/389-ds-base/issue/49446
    
    Reviewed by: Simon, Thierry and William
    
    Signed-off-by: Simon Pichugin <spichugi@redhat.com>