Automatic merge from submit-queue (batch tested with PRs 66850, 66902, 66779, 66864, 66912). 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>.
update polymorphichelpers for external types
and updates expose to externals as proof
@kubernetes/sig-cli-maintainers
/assign @soltysh @juanvallejo
```release-note
NONE
```
a54c0974e3