fix(auth, ios): demonstrate test integration of upstream fix 13772

[mikehardy]

This is not for merge

This is a demonstration of how to patch a source file integrated via cocoapods in a react-native context

It should handle these cases:

• no tools installed (that is, there are things like [cocoapods-patch](https://github.com/DoubleSymmetry/cocoapods-patch) but you have to install things, that is unwanted
• patch is already applied (using --forward and the (command || true) construction in patch call means it will silently proceed without a non-zero exit code, even if patch is already applied)

Doing something like this in your project may help you test-integrate the upstream fix to see if it stops the crashing for you

See related discussion at https://github.com/firebase/firebase-ios-sdk/issues/13761