Automatic merge from submit-queue (batch tested with PRs 46979, 47078, 47138, 46916)

HPA: only send updates when the status has changed

This commit only sends updates if the status has actually changed.
Since the HPA runs at a regular interval, this should reduce the volume
of writes, especially on short HPA intervals with relatively constant
metrics.

Fixes #47077

**Release note**:
```release-note
The HorizontalPodAutoscaler controller will now only send updates when it has new status information, reducing the number of writes caused by the controller.
```