Improve stable hash input for local type names (#52300)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52300

Targeted improvement to `versionExportedApis` (D77303917) to reduce noise.

This eliminates the false positive from a rename to a local (unexported) type, that does not structurally change the shape of exported types.

Changelog: [Internal]

Reviewed By: rubennorte

Differential Revision: D77314292

fbshipit-source-id: 4de90f5b5f1b622225762b2a73e386538000d54a