Fix CocoaPods crash with nonexistent files

[tyronet-sportsbet]

Summary:

Xcode Projects can contain files that don't exist until build time. If one of these happens to end with Info.plist (as is this case with our project), CocoaPods will crash, since utils.rb tries to patch all of these with ATS stuff. In the case where these files don't exist on disk, this CocoaPods post-install job should simply ignore those file references.

Changelog:

[IOS] [FIXED] - Fixed CocoaPods crashing when Xcode project contains non-existent -Info.plist file

Test Plan:

I've refactored the apply_ats_config method to also accept a file_manager param so that the file manager can be mocked in the unit tests. I have confirmed that the unit tests continue to pass, and also when I have applied the changes to utils.rb in react native in our main project's node_modules, a pod install now no longer crashes.

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[tyronet-sportsbet]

Apologies for letting this die on the vine; we're still trying to get the CLA signed at the corporate level and this takes time. In the meantime, I've noticed this patch is now no longer necessary due to #42637, so I'm closing this PR for now. If that ATS config patch system ever makes its way back in though it's worth keeping in mind this particular use case. Thanks!