Automatic merge from submit-queue (batch tested with PRs 37468, 36546, 38713, 38902, 38614)
Remove extensions/v1beta1 Job
Fixes https://github.com/kubernetes/kubernetes/issues/32763. This endpoint was deprecated in 1.5 and was planned to be removed in 1.6.
**Release note**:
```release-note
Remove extensions/v1beta1 Jobs resource, and job/v1beta1 generator.
```