Bring back @flow strict to composeStyles and fix Flow errors (#51803)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51803

The `flow strict` annotation was accidently removed in D74574293. This diff brings it back and fixes flow errors caused by this change. This makes generated TS types for `composeStyles` more relaxed but the main idea of inferring inputs base on output type annotation is preserved.

Changelog:
[Internal]

Reviewed By: huntie

Differential Revision: D75945388

fbshipit-source-id: c24ff8ad5d286e16bca3522e82f02e14f660c0dd