Merge pull request #50613 from adk3798/grafana-anonymous

mgr/cephadm: allow configuring anonymous access for grafana

Reviewed-by: Redouane Kachach <rkachach@redhat.com>

diff --cc doc/cephadm/services/monitoring.rst
Simple merge

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

diff --cc src/python-common/ceph/deployment/service_spec.py
Simple merge

diff --cc src/python-common/ceph/tests/test_service_spec.py
Simple merge