mgr/cephadm: update timestamp on repeat daemon/service events

mgr/cephadm: update timestamp on repeat daemon/service events

If you have a daemon/service event and then an identical
event happens later (e.g. the same daemon is redeployed
multiple times) the events are not updated on the repeat
instances. In cases like this I think it makes more
sense to update the timestamp so users can see the most
recent time the event happened.

Fixes: https://tracker.ceph.com/issues/63238
Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit 13512cc202c90abd6c5f1e2747d121cc07689d1b)