Merge pull request #46876 from neesingh-rh/feature_55821

mgr/volumes: add interface to check the presence of subvolumegroups/subvolumes

Reviewed-by: Venky Shankar <vshankar@redhat.com>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Nikhilkumar Shelke <nshelke@redhat.com>
Reviewed-by: Anthony D'Atri <anthony.datri@gmail.com>

diff --cc qa/tasks/cephfs/test_volumes.py
Simple merge