Automatic merge from submit-queue (batch tested with PRs 45322, 44770, 45411)

Put podAntiAffinity in PodSpec.

**What this PR does / why we need it**:

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

**Special notes for your reviewer**:

In 1.6, we moved the `affinity` from `annotations` to `PodSpec`, but the `annotations` still works with `AffinityInAnnotations=true`. Please check https://docs.google.com/document/d/1YP3OJTKMpXkWAhipPjx9-bDMxJ87JZ6AcVak7c3SGos/edit for detail.

**Release note**:

```release-note
```

Fixed #45318