feat(0.79): generate codegen before pod install

[szymonrybczak]

Summary

Starting from React Native 0.79 pod install won't invoke codegen generation logic so we have to do inside CLI.

Test Plan

yarn ios in your project should generate codegen under ios/build and install Cocoapods properly.

Checklist

• Documentation is up to date.
• Follows commit message convention described in CONTRIBUTING.md.
• For functional changes, my test plan has linked these CLI changes into a local react-native checkout (instructions).

[cipolleschi]

Left a couple of comments to make the code more maintainable!
But thank you for implementing this.

[cipolleschi]

This should be the location of the xcodeproj file. f that's the case, we are good to go.

[thymikee]

@szymonrybczak let's call this cariable sourceDir instead of root then and pass proper value

[szymonrybczak]

I don't think so, root is where package.json should be - based on this code:

https://github.com/facebook/react-native/blob/e41887e62fcaf5a8d6bfc2817f88298b49d1b7a5/packages/react-native/scripts/codegen/generate-artifacts-executor.js#L995

[cipolleschi]

thanks for applying the suggestions!