Automatic merge from submit-queue (batch tested with PRs 54005, 55127, 53850, 55486, 53440). 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>.

Enforce use of fixed size int types in the API

Changes 'int' to 'int32', enforced by import_known_versions_test

Follow up to PR #53402



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

This PR changes a few fields within the API from 'int' to 'int32' and is now enforced by import_known_versions_test.  We need this so integer fields are the same size regardless of $GOARCH.

**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**:

**Release note**:

```release-note
```