Automatic merge from submit-queue (batch tested with PRs 65805, 65811, 65833, 65488, 65857). 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>.
flatten nested lists for flatten in visitor
Lists which contain lists should themselves be flattened by a flatten call to the resource builder
@kubernetes/sig-cli-maintainers
@soltysh @juanvallejo
```release-note
NONE
```
1e8ef574c3