mgr/dashboard: Add ceph_daemon filter to rgw overview grafana panel

mgr/dashboard: Add ceph_daemon filter to rgw overview grafana panel
queries

Currently rgw_servers filtering is not working in RGW Overview garfana graphs.
It is showing data of all the RGW services, even though filter set to single service.
This PR intends to solve this issue

Fixes: https://tracker.ceph.com/issues/69074
Signed-off-by: Aashish Sharma <aasharma@redhat.com>
(cherry picked from commit 666f8faf11c0a639ce6ead06026850dd72a14d41)

Conflicts:
	monitoring/ceph-mixin/dashboards/rgw.libsonnet (conflicts with
metric names like ceph_rgw_put_initial_lat_sum)
	monitoring/ceph-mixin/dashboards_out/radosgw-overview.json
(conflicts with metrics names like ceph_rgw_put_initial_lat_sum)