Summary:
running
```
arc focus2 rntester-ios --full-debug-symbols --should-merge-targets -a '//xplat/js/react-native-github/packages/react-native/*' --open --force-with-bad-commit
```
was creating the folder `rntesterIOS.xcodeproj.local` that was not ignored and messing up the relevant files for source control.
Reviewed By: hoxyq
Differential Revision: D68625659