Automatic merge from submit-queue. 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>.

unstructured helpers: print path in error

Prints the path in the error message for `Unstructured` helper functions, giving more useful info.

Useful for https://github.com/kubernetes/kubernetes/pull/55168.

**Release note**:

```release-note
NONE
```

/assign sttts ash2k