Array's with unparsable element type's are explicitly Any vs missing (#46221)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46221

Previously the schema special cased unparseable elementType with elementType just being undefined. This causes issues for logic that requires recursively matching types. Instead of being implicit, this makes them explicitly an AnyTypeAnnotation

Changelog: [Internal]

Reviewed By: makovkastar

Differential Revision: D61825742

fbshipit-source-id: 47bf70d32d21647896d8f5319087378cc8ac8d4f