Automatic merge from submit-queue (batch tested with PRs 48970, 52497, 51367, 52549, 52541). 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>..
Enable autoscaling/v2beta1 by default
The PR which graduated autoscaling/v2alpha1 to beta accidentally
missed enabling the API group by default. This rectifies that.
**Release note**:
```release-note
The autoscaling/v2beta1 API group is now enabled by default.
```