Automatic merge from submit-queue (batch tested with PRs 50000, 49954, 49943, 50018, 49607)

change apps/v1beta2 StatefulSet observedGeneration from a pointer to an int for consistency

**What this PR does / why we need it**:
change the StatefulSet observedGeneration from a pointer to an int for consistency

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #49623
xref #49135

**Special notes for your reviewer**:
/cc @janetkuo @foxish @kow3ns 

**Release note**:

```release-note
change apps/v1beta2 StatefulSet observedGeneration (optional field) from a pointer to an int for consistency
```