Supports Built-in Kotlin

WARNING: Your app uses the following plugins that apply Kotlin Gradle Plugin (KGP): android_id
Future versions of Flutter will fail to build if your app uses plugins that apply KGP.

Please check the changelogs of these plugins and upgrade to a version that supports Built-in Kotlin.
If no such version exists, report the issue to the plugin. If necessary, here is a guide on filing
an issue against a plugin: https://docs.flutter.dev/release/breaking-changes/migrate-to-built-in-kotlin/for-app-developers#report-incompatible-kotlin-gradle-plugin-usage-to-plugin-authors

If you are a plugin author, please migrate your plugin to Built-in Kotlin using this guide: https://docs.flutter.dev/release/breaking-changes/migrate-to-built-in-kotlin/for-plugin-authors

Start with Flutter's linked guide for plugin authors, then inspect the android_id plugin's Kotlin Gradle Plugin usage and Android build configuration. The migration is complete when the plugin uses Built-in Kotlin as described by the guide and the warning no longer appears for apps using android_id.

Written by the indexing model from the issue text.