mgr/dashboard: Host Maintenance Feature

mgr/dashboard: Host Maintenance Feature

In Cluster -> Hosts, I've added additional button to put the selected host on maintenance or exit out of the maintenance mode. Also for some hosts the ok-to-stop tests may trigger some warnings which requires a --force command to pass along with the maintenance enter command to enter a host into maintenance. In UI this is achieved using a confirmation Modal. In addition to this if the check error is It is NOT safe to stop the host then the host wont be able to put into maintenance mode.

Fixes: https://tracker.ceph.com/issues/49101
Signed-off-by: Nizamudeen A <nia@redhat.com>
(cherry picked from commit 0780fc131d1484601318eb0ec39f14955c731e16)