fix: dont mess up EXCLUDED_ARCHS[sdk=iphonesimulator*] after pod install

[pvinis]

Summary

#31118

When running pod install on an M1 machine, the xcodeproj file is messed up and while it works for M1 machines, it doesn't on other non-M1 machines, and also doesn't work on ci, since usually they don't use M1s.

This change makes sure that it will not mess with the xcodeproj file.

some real world usage:

• https://github.com/artsy/eigen/blob/main/patches/react-native%2B0.66.5.patch#L150-L154
• https://github.com/artsy/eigen/blob/main/HACKS.md#react-native-patch-package-excluded_archs-part-only

Changelog

Test Plan

You can try to run pod install on an m1 and a non-m1, and see that the EXCLUDED_ARCHS[sdk=iphonesimulator*] don't change.

[pvinis]

woops. i think i had it flipped. nvm.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,493,485	+0
android	hermes	armeabi-v7a	7,813,452	+0
android	hermes	x86	8,967,867	+0
android	hermes	x86_64	8,827,371	+0
android	jsc	arm64-v8a	9,679,111	+0
android	jsc	armeabi-v7a	8,412,818	+0
android	jsc	x86	9,742,216	+0
android	jsc	x86_64	10,220,841	+0

Base commit: 91397d4
Branch: main