This was a manual cherry pick of #185953. ### Issue Link: What is the link to the issue this cherry-pick is addressing? #186100 ### Impact Description: What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping of production apps (the app crashes on launch). This information is for domain experts and release engineers to understand the consequences of saying yes or no to the cherry pick. All newly created Flutter Android apps, plugins, and add-to-app scenarios. ### Changelog Description: Explain this cherry pick: * In one line that is accessible to most Flutter developers. * That describes the state prior to the fix. * That includes which platforms are impacted. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples. < Replace with changelog description here > [flutter/186100](#186100): When Flutter Android apps, plugins, and app-to-app scenarios are newly created, they will be on AGP 9 and be migrated to Built-in Kotlin. ### Workaround: Is there a workaround for this issue? This change must be made. If we upgrade to AGP 9, we must migrate off of Built-in Kotlin. ### Risk: What is the risk level of this cherry-pick? ### Test Coverage: Are you confident that your fix is well-tested by automated tests? ### Validation Steps: What are the steps to validate that this fix works? - `flutter create` a new app then run `flutter build apk` - `flutter create` a new plugin then navigate to the example project and run `flutter build apk` - follow the instructions for add-to-app scenarios [here](https://docs.flutter.dev/add-to-app/android/project-setup). If you can sucessfully run the android host project `./gradlew :assembleDebug`, your build was successful.

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[AGP 9] Update Template to AGP 9 #186100

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