ic_launcher icon not working for android push notifications

I added `flutter_launcher_icons: ^0.13.1` to my flutter project:

```
flutter_launcher_icons:
android: "ic_launcher"
ios: true
image_path: "assets/icon.png"
remove_alpha_ios: true
adaptive_icon_background: "assets/ic_background.png"
adaptive_icon_foreground: "assets/ic_logo.png"
```

all icons are working except the push notifications. the icon in the push notifications looking like this:



i thinks its because of the missing ic_launcher icon in the folder because in my manifest I have:

`android:icon="@mipmap/ic_launcher"`

How is the right way to implement the push notifications icon with this plugin?

```
[✓] Flutter (Channel stable, 3.16.5, on macOS 14.1.2 23B92 darwin-arm64, locale de-DE)
• Flutter version 3.16.5 on channel stable at /Users/xxx/development/tools/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 78666c8dc5 (vor 4 Wochen), 2023-12-19 16:14:14 -0800
• Engine revision 3f3e560236
• Dart version 3.2.3
• DevTools version 2.28.4

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
• Android SDK at /Users/xxx/Library/Android/sdk
• Platform android-34, build-tools 34.0.0
• ANDROID_HOME = /Users/xxx/Library/Android/sdk
• ANDROID_SDK_ROOT = /Users/xxx/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15A507
• CocoaPods version 1.14.3

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• android-studio-dir = /Applications/Android Studio.app
• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] VS Code (version 1.85.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.80.0

[✓] Connected device (4 available)
• Pixel 6a (mobile) • 35171JEGR02908 • android-arm64 • Android 13 (API 33)
•iPhone (mobile) • 00008130-000A49440230001C • ios • iOS 17.2.1 21C66
• macOS (desktop) • macos • darwin-arm64 • macOS 14.1.2 23B92 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 120.0.6099.216
! Error: Browsing on the local area network for xxx iPhone. Ensure the device is unlocked and attached with a cable or associated with the same local area network as this Mac.
The device must be opted into Developer Mode to connect wirelessly. (code -27)

[✓] Network resources
• All expected network resources are available.

• No issues found!
```

Start with the Android manifest entry and the Flutter launcher-icons configuration shown in the report. Check how Android push notifications select their icon and whether this plugin documents or generates a compatible resource. Done means a supported configuration is identified, or the plugin's limitation is clearly documented.

Written by the indexing model from the issue text.