mgr/dashboard: snapshot mirroring from dashboard

mgr/dashboard: snapshot mirroring from dashboard

Enable snapshot mirroring from the Pools -> Image

Also show the mirror-snapshot in the image where snapshot is enabled

When parsing images if an image has the snapshot mode enabled, it will
try to  run commands that don't work with that mode. The solution was
not running those for now and appending the mode in the get call.

Fixes: https://tracker.ceph.com/issues/55648
Signed-off-by: Pere Diaz Bou <pdiazbou@redhat.com>
Signed-off-by: Nizamudeen A <nia@redhat.com>
Signed-off-by: Aashish Sharma <aasharma@redhat.com>
Signed-off-by: Avan Thakkar <athakkar@redhat.com>