Simplify CompleteTypeAnnotation (#48473)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48473

This is such a simpler approach lol.

I'll need this later for when I want to pass in arrays or objects of these types to the compat check

Changelog: [internal]

Reviewed By: cipolleschi

Differential Revision: D67806812

fbshipit-source-id: 5cc361815fea901098d2931ba78293693ecc0a35