Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
remove rootscopedkinds from groupmeta
builds on https://github.com/kubernetes/kubernetes/pull/63206
Since, a RESTMapping can only be determined based on a connection to a server, the only thing that needs to know the namespaced-ness of a resource is the code doing the registration. Everything else is derived from that source of truth. This removes the other dangling references and collapses down onto the existing namespaced-ness methods in the strategies backing the stores.
@kubernetes/sig-api-machinery-pr-reviews
```release-note
NONE
```