qa/suites: add "mon down" log variations to ignorelist

qa/suites: add "mon down" log variations to ignorelist

Fixes: https://tracker.ceph.com/issues/64864
Signed-off-by: Laura Flores <lflores@ibm.com>
(cherry picked from commit d475ac3e6ab86a4913e1d318989c617031978bc2)

Conflicts:
	qa/suites/orch/cephadm/smoke/start.yaml
	qa/suites/orch/cephadm/workunits/task/test_host_drain.yaml
	qa/suites/orch/cephadm/workunits/task/test_monitoring_stack_basic.yaml
	qa/suites/orch/cephadm/workunits/task/test_rgw_multisite.yaml
	qa/suites/orch/cephadm/workunits/task/test_set_mon_crush_locations.yaml

	The log-only-match entry was backported to squid before the ignorelist changes,
        but in main it was introduced after the ignorelist changes.
        See https://github.com/ceph/ceph/commit/b4522dd332d40a54b9e0be58bd96aeaa345f8977.