fix: ios example duplicated symbols due to codegen

[atlj]

Summary

Fixed #755

There is an effort towards shipping React Native in a prebuilt format on iOS. As a result, some of the codegen-related custom code have to be generated at the build time. However, these changes also affected the codegen generated native code for libraries. This PR patches that behavior on bob level.

Related PRs:

• Generate RCTThirdPartyComponentProvider facebook/react-native#47518
• Generate RCTAppDependencyProvider for apps facebook/react-native#47650
• Stop generating RCTThirdPartyLibraryComponentProvider facebook/react-native#47517

Test plan

This adds 3 unit test cases to make sure we're able to parse the codegen paths and delete the necessary files.

To test it locally:

1. Build bob
2. Create a new library using npx create-react-native-library, and pick turbo modules
3. Link the local bob by calling yarn link path/to/bob --all in the new library
4. Call yarn bob build --target codegen
5. Make sure there is no .podspec file or mm files in android/generated
6. Make sure there is no .podspec file or any of the following files in ios/generated:

  'RCTAppDependencyProvider.h',
  'RCTAppDependencyProvider.mm',
  'RCTModulesConformingToProtocolsProvider.h',
  'RCTModulesConformingToProtocolsProvider.mm',
  'RCTThirdPartyComponentsProvider.h',
  'RCTThirdPartyComponentsProvider.mm',
  'ReactAppDependencyProvider.podspec',