feat: make __gitignore file work for OOT platforms (#42963)

Summary:
This PR makes `__gitignore` file universal for Apple OOT platforms.

## Changelog:

[GENERAL] [CHANGED] - Make template's .gitignore file universal for OOT platforms

Pull Request resolved: #42963

Test Plan: CI Green

Reviewed By: NickGerleman

Differential Revision: D53674632

Pulled By: yungsters

fbshipit-source-id: cb510d9bd2ee6f1c39b77a842e7947b67def552a

packages/react-native/template/_gitignore

@@ -20,7 +20,7 @@ DerivedData
 *.hmap
 *.ipa
 *.xcuserstate
-ios/.xcode.env.local
+**/.xcode.env.local
 
 # Android/IntelliJ
 #
@@ -56,7 +56,7 @@ yarn-error.log
 *.jsbundle
 
 # Ruby / CocoaPods
-/ios/Pods/
+**/Pods/
 /vendor/bundle/
 
 # Temporary files created by Metro to check the health of the file watcher