Merge pull request #47942 from adk3798/wip-57375-quincy

quincy: mgr/dashboard: enable addition of custom Prometheus alerts

Reviewed-by: Anthony D'Atri <anthonyeleven@users.noreply.github.com>

diff --cc src/pybind/mgr/cephadm/services/monitoring.py
Simple merge

diff --cc src/pybind/mgr/cephadm/tests/test_services.py
Simple merge