Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/33982
This Diff moves another 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: D37006265
fbshipit-source-id: ffaac3270cb098fa30b73c97ce7cd350dfb8d7d6