Remove retired command manifest versions (#7937)
Remove retired command manifest versions (#7937)

`istioctl manifest versions` was removed as part of https://github.com/istio/istio/pull/23512/.
The validation of version is done during istioctl upgrade
istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io