Fix Rosetta2 CocoaPods warning on Apple Silicon (#32498)

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: #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

scripts/react_native_pods.rb

@@ -21,7 +21,7 @@ def use_react_native! (options={})
   # Include Hermes dependencies
   hermes_enabled = options[:hermes_enabled] ||= false
 
-  if `/usr/sbin/sysctl -n hw.optional.arm64 2>&1`.to_i == 1 && !RUBY_PLATFORM.start_with?('arm64')
+  if `/usr/sbin/sysctl -n hw.optional.arm64 2>&1`.to_i == 1 && !RUBY_PLATFORM.include?('arm64')
     Pod::UI.warn 'Do not use "pod install" from inside Rosetta2 (x86_64 emulation on arm64).'
     Pod::UI.warn ' - Emulated x86_64 is slower than native arm64'
     Pod::UI.warn ' - May result in mixed architectures in rubygems (eg: ffi_c.bundle files may be x86_64 with an arm64 interpreter)'