Repository: flutter
Issue: [Documentation] Clarify that backdrop filter doesn't filter Android views
Labels: platform-android,engine,has reproducible steps,P3,found in release: 3.10,team-android,triaged-android,found in release: 3.13

### Is there an existing issue for this?

- [X] I have searched the [existing issues](https://github.com/flutter/flutter/issues)
- [X] I have read the [guide to filing a bug](https://flutter.dev/docs/resources/bug-reports)

### Steps to reproduce

- Add this to your `res/values/styles.xml`

```xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme.Transparent" parent="android:Theme">
        <item name="android:windowBackground">@android:color/white</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:backgroundDimEnabled">false</item>
        <item name="android:windowShowWallpaper">true</item>
    </style>
</resources>
```
- Update `AndroidManifest.xml`

```diff
- android:theme="@style/LaunchTheme"
+ android:theme="@style/Theme.Transparent" 
```
- Update `MainActivity.kt`

```diff
+    override fun onFlutterSurfaceViewCreated(flutterSurfaceView: FlutterSurfaceView) {
+        flutterSurfaceView.setZOrderMediaOverlay(true)
+        flutterSurfaceView.holder.setFormat(android.graphics.PixelFormat.TRANSLUCENT)
+        super.onFlutterSurfaceViewCreated(flutterSurfaceView)
+    }
```

- Try to use `BackdropFilter` widget

```dart
ClipRRect(
  child: BackdropFilter(
    filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
    child: Container(
      height: 100,
      width: 100,
      color: Colors.transparent,
    ),
  ),
)
```

### Expected results

`BackdropFilter` works

### Actual results

`BackdropFilter` doesn't work

### Code sample

```dart
// See steps to reproduce
```

### Screenshots or Video

_No response_

### Logs

_No response_

### Flutter Doctor output

<details><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.10.6, on macOS 13.0 22A380 darwin-arm64, locale en-PL)
    • Flutter version 3.10.6 on channel stable at /Users/lesnitsky/flutter-sdk
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f468f3366c (4 weeks ago), 2023-07-12 15:19:05 -0700
    • Engine revision cdbeda788a
    • Dart version 3.0.6
    • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    • Android SDK at /Users/lesnitsky/Library/Android/sdk
    • Platform android-33, build-tools 32.1.0-rc1
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14E300c
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • 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
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.80.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.70.0

[✓] Connected device (3 available)
    • sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64  • Android 13 (API 33) (emulator)
    • macOS (desktop)             • macos         • darwin-arm64   • macOS 13.0 22A380 darwin-arm64
    • Chrome (web)                • chrome        • web-javascript • Google Chrome 115.0.5790.114

[✓] Network resources
    • All expected network resources are available.

• No issues found!
```

</details>