ceph: disable ceph mgr test temporarily
ceph: disable ceph mgr test temporarily

The CI keeps failing intermittently due to
https://github.com/rook/rook/issues/5877 and the fix has not merged yet
so disabling until fixed.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

rook/nfs,rook/rook,rook/rook,rook/nfs,rook/rook,rook/rook,rook/rook,rook/nfs