flutter 3.22.0版本的webview_flutter没有回调onNavigationRequest方法，导致无法正常拦截url是否进行加载，之前的flutter 3.7.12版本是有回调的

### Steps to reproduce

APP使用下面这个webview加载url页面，并设置webview的onNavigationRequest回调方法，正常情况下webview加载页面之前，应该要先回调onNavigationRequest方法，让APP根据url判断是否需要进行加载

webview_flutter:
  git:
    url: "https://gitee.com/openharmony-sig/flutter_packages.git"
    path: "packages/webview_flutter/webview_flutter"

### Expected results

使用webview_flutter加载url页面，正常回调onNavigationRequest该方法，根据需要拦截url

### Actual results

使用webview_flutter加载url页面，没有回调onNavigationRequest该方法，导致无法根据需要拦截url，之前的flutter 3.7.12(https://gitee.com/openharmony-sig/flutter_flutter/tree/dev/)版本是有回调的。

### Code sample

<details open><summary>Code sample</summary>

```dart
NavigationDelegate(
   // 说明：这个方法（3.7.12-ohos(https://gitee.com/openharmony-sig/flutter_flutter/tree/dev/)是有回调，
   // 但oh-3.22.0(https://gitee.com/harmonycommando_flutter/flutter/tree/oh-3.22.0/)没有回调）
   onNavigationRequest: (NavigationRequest request) {
     print('onNavigationRequest: ${request.url}');
     // 拦截这个store://appgallery.huawei.com/app/detail?id=xxx地址
     // 跳转到鸿蒙应用商店进行下载
     if (request.url.contains('store://appgallery.huawei.com/app/detail?id=xxx')) {
       // todo 跳转到鸿蒙应用商店进行下载
       return NavigationDecision.prevent;
     }
     return NavigationDecision.navigate;
   },

onProgress: (int loadProgress) {
     pageInfoController.setProgress(loadProgress / 100);
   },

onPageStarted: (String loadUrl) async {
     print('onPageStarted: ${loadUrl}');

},

onPageFinished: (String loadUrl) async {
     print('onPageFinished: ${loadUrl}');
   }
};
```

</details>

### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

[Upload media here]

</details>

### Logs

```console
[Paste your logs here]
```

</details>

### Flutter Doctor output

<details open><summary>output</summary>

```console
Flutter (Channel oh-3.22.0, 3.22.1-0.0.pre.28, on Microsoft Windows [版本 10.0.22631.4460], locale
zh-CN)
• Flutter version 3.22.1-0.0.pre.28 on channel oh-3.22.0 at D:\develop\Huawei\flutter
! Warning: `flutter` on your path resolves to D:\develop\flutter\sdk\bin\flutter, which is not
inside your current Flutter SDK checkout at D:\develop\Huawei\flutter. Consider adding
D:\develop\Huawei\flutter\bin to the front of your path.
! Warning: `dart` on your path resolves to D:\develop\flutter\sdk\bin\dart, which is not inside
your current Flutter SDK checkout at D:\develop\Huawei\flutter. Consider adding
D:\develop\Huawei\flutter\bin to the front of your path.
! Upstream repository https://gitee.com/harmonycommando_flutter/flutter.git is not a standard
remote.
Set environment variable "FLUTTER_GIT_URL" to
https://gitee.com/harmonycommando_flutter/flutter.git to dismiss this error.
• Framework revision 2f5301dec0 (2 weeks ago), 2024-12-30 12:15:32 +0000
• Engine revision f6344b75dc
• Dart version 3.4.0
• DevTools version 2.34.1
• Pub download mirror https://pub.flutter-io.cn
• Flutter download mirror https://storage.flutter-io.cn
• If those were intentional, you can disregard the above warnings; however it is recommended to
use "git" directly to perform update checks and upgrades.

[✓] HarmonyOS toolchain - develop for HarmonyOS devices
• OpenHarmony Sdk at D:\Program Files\DevEco Studio\sdk, available api versions has [13:default]
• Ohpm version 5.0.10
• Node version v18.20.1
• Hvigorw binary at D:\Program Files\DevEco Studio\tools\hvigor\bin\hvigorw

工程机版本：（如：NOH-AN00 204.0.0.65(SP1C00E67R1P12)）

DevEco Studio版本：（DevEco Studio 5.0.1 Release Build Version: 5.0.5.315）
```

</details>

鸿蒙突击队/flutter
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鸿蒙突击队/flutter暂停 .gitee-modal { width: 500px !important; }

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