mon: block osd pool mksnap for fs pools

mon: block osd pool mksnap for fs pools

Commit 23db15d5c2b disabled pool snaps for the rados mksnap path. But
ceph osd pool mksnap was an alternate way that pool snaps could be
created.
This commit disables pool snaps via this alternate path as well.

NOTE:
Pool-level snaps and fs-level snaps can't co-exist since snap IDs are
likely to clash between the two different mechanisms and can result in
unintentional data loss when either of the snaps are deleted.

Fixes: https://tracker.ceph.com/issues/59552
Signed-off-by: Milind Changire <mchangir@redhat.com>
(cherry picked from commit 6203fe15289d27bf02441fd413a40371cb0bc516)