Merge PR #56479 into reef

* refs/pull/56479/head:
	pybind/mgr/devicehealth: skip legacy objects that cannot be loaded
	qa: test devicehealth legacy load of deleted snap obj
	qa: allow failing whatever the active mgr is
	qa: add unit tests for MgrMap down flag
	mon/MgrMonitor: add "down" setting to simplify testing

Reviewed-by: Laura Flores <lflores@redhat.com>