mgr/orchestrator: remove image name field from 'orch ps' and 'orch ls'

mgr/orchestrator: remove image name field from 'orch ps' and 'orch ls'

Now that we're typically using the image digests the name isn't as helpful. We also
end up in scenarios where some images use tags for their name and others use the
digest so the image name comes out as "mix" in orch ls despite it being the same image.

Fixes: https://tracker.ceph.com/issues/47333
Signed-off-by: Adam King <adking@redhat.com>