Summary:
The current warning assumes the ruby binary to be single arch, but the ruby version shipping with macOS is universal `universal.arm64e-darwin20`. This PR changes the check to search for `arm64` in any position instead of just the beginning to fix false positives.
## Changelog
[iOS] [Fixed] - Fix Rosetta2 CocoaPods warning on Apple Silicon
Pull Request resolved: https://github.com/facebook/react-native/pull/32498
Test Plan:
### Before
On M1 Mac `pod install` using system ruby always yields a warning.
### After
`pod install` does not yield a warning.
`arch -x86_64 pod install` yields a warning.
Reviewed By: fkgozali
Differential Revision: D32013176
Pulled By: sota000
fbshipit-source-id: 84f517c210318b5d073d161b6849b9aee367bba6