Automatic merge from submit-queue (batch tested with PRs 43545, 44293, 44221, 43888)

make unstructured items correspond to other items for storage

"normal" `Items` elements include the struct itself, not a pointer to the struct.  Some of the deeper bits of storage rely on this behavior in reflective paths.

This updates the `UnstructuredList` to be "normal".

@kubernetes/sig-api-machinery-pr-reviews