Update the template to use RNGP (#35075)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/35075

This diff updates the New App template for Android to use the React Native Gradle Plugin.
With this we can:
1. Get rid of all the C++ code.
2. Remove a lot of New Architecture logic in the build.gradle
3. Reuse the prebuilts of React Native/Hermes via prefab

Changelog:
[Android] [Changed] - Update the template to use RNGP

Reviewed By: cipolleschi

Differential Revision: D40673732

fbshipit-source-id: 70935248993d1e24904c982e75f12ad580faa9d8