Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/33978
This Diff moves part of the utilities from the `react_native_pods` file to a specific `utils.rb` file.
It adds tests for these utils and improve our test mocks.
The goal is to simplify the `react_native_pods.rb` so it's easier to work with it.
I decided to split this diff in 2 because it was becoming quite big.
## Changelog
[iOS][Changed] - Refactoring part of the react_native_pods.rb script
Reviewed By: cortinico
Differential Revision: D37004347
fbshipit-source-id: a5156f7c199d082d5d895a58af80948556c51c2a
Riccardo Cipolleschi