chore: remove unused native_modules files

[thymikee]

Summary:

Native autolinking logic for iOS and Android moved to the core react-native repository with RN 0.75, which ties to RNC CLI v14.x:

• iOS: https://github.com/facebook/react-native/blob/8c50bf0beb17ced7fdafeae7a734edfc03e6e0b2/packages/react-native/scripts/cocoapods/autolinking.rb#L4
• Android: https://github.com/facebook/react-native/blob/8c50bf0beb17ced7fdafeae7a734edfc03e6e0b2/packages/gradle-plugin/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/ReactExtension.kt#L162

These files should essentially be unused now in 0.75+ apps.

Test Plan:

Adjusted the documentation accordingly and removed the integration test for iOS autolinking.

Checklist

• Documentation is up to date to reflect these changes.
• Follows commit message convention described in CONTRIBUTING.md

[szymonrybczak]

🧹

[cortinico]

Thanks for the cleanup @thymikee

[cortinico]

I was thinking instead of deleting this file we can just let it print a huge warning on what to do instead

[thymikee]

Oh that's very reasonable, will update

[thymikee]

This is how warning messages look like for:

Android (when running run-android):

iOS (when running pod install):