Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/34025
This diff moves the monkeypatch LocalPodspecPatch to a dedicated ruby file.
It also adds test for that
## Changelog
[iOS][Changed] - Move LocalPodspecPatch to dedicated file
Reviewed By: cortinico
Differential Revision: D37069361
fbshipit-source-id: 28fddb197484f45aa20ccac516c874e79448e999