Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/32755
Changelog: [Internal] Make the Reat-Codegen script_pahses only triggered when the in-app libaries are modified. When other libraries like ones inside node_modules are modified, you'll need to run `USE_CODEGEN_DISCOVERY=1 pod install` to update the source.
Reviewed By: cortinico
Differential Revision: D33007986
fbshipit-source-id: 0546bbd1d57cd54a482d71b43b296484de60a92c