feat: enable opt outs in helloworld template

Author: hurali97

private/helloworld/android/gradle.properties

@@ -11,3 +11,8 @@ reactNativeArchitectures=arm64-v8a
 newArchEnabled=true
 hermesEnabled=true
 edgeToEdgeEnabled=false
+
+# Opt out of built-in kotlin and new DSL behavior that ships with AGP 9.
+# Starting from AGP 10.x these opt outs will be removed.
+android.builtInKotlin=false
+android.newDsl=false