Automatic merge from submit-queue (batch tested with PRs 39284, 39367)

Remove HostRecord annotation (beta feature)

The annotation has made it to GA so this code should be deleted.

**Release note**:
```release-note
The 'endpoints.beta.kubernetes.io/hostnames-map' annotation is no longer supported.  Users can use the 'Endpoints.subsets[].addresses[].hostname' field instead.
```