feat(adjust): remove iAd.framework as it's legacy

[huextrat]

Why

Remove the legacy iAd.framework from the react-native-adjust config plugin. According to Apple's documentation, iAd has been deprecated and is no longer supported. The framework should not be included in modern iOS apps.

How

• Removed the iAd.framework linking from the withAdjustPlugin function
• Kept all other iOS frameworks (AdServices, AdSupport, StoreKit, AppTrackingTransparency) which are still actively supported
• No changes to Android configuration or plugin parameters

Test Plan

Manual Testing:

1. Basic functionality test:

   {
     "plugins": ["@config-plugins/react-native-adjust"]
   }

   • Run npx expo prebuild --clean
   • Verify that iAd.framework is not linked in the iOS project
   • Verify other frameworks (AdServices, AdSupport, StoreKit, AppTrackingTransparency) are still properly linked

2. Build verification:

   • Run npx expo run:ios
   • Verify the app builds successfully without iAd.framework
   • Confirm Adjust SDK functionality remains intact

Expected Results:

• iOS project should not include iAd.framework in linked libraries
• All other iOS frameworks should remain properly configured
• App should build and run without issues
• Adjust SDK attribution and tracking should continue to work normally