Repository: flutter
Issue: [SelectableText] IOS text selection toolbar options do not match native platform
Labels: platform-ios,framework,a: fidelity,a: typography,has reproducible steps,P2,found in release: 2.10,found in release: 2.11,team-ios,triaged-ios

"Select All" button is absent in the toolbar for the "SelectableText" widget in iOS Simulator, but present in Android emulator

## Steps to Reproduce

1. Execute `flutter run` on the code sample
2. Select the text in an iOS simulator, the "Select All" button is not shown in the toolbar. Select the text in an Android emulator, the "Select All" button is shown in the toolbar.

**Expected results:** 

"Select All" button should be present in the toolbar for the ```SelectableText``` widget on iOS

**Actual results:** 

"Select All" button is absent in the toolbar for the ```SelectableText``` widget on iOS

<details>
<summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: "Selectable text bug"),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: const Center(
        child: SelectableText(
          "Some text",
          toolbarOptions: ToolbarOptions(copy: true, selectAll: true),
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

```

</details>

<details>
  <summary>Logs</summary>

Flutter analyze:

```
No issues found! (ran in 2.1s)
```

Flutter Doctor:

```
[✓] Flutter (Channel stable, 2.10.1, on macOS 12.1 21C52 darwin-arm, locale
    en-IN)
    • Flutter version 2.10.1 at /Users/ankushlaxman/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision db747aa133 (3 weeks ago), 2022-02-09 13:57:35 -0600
    • Engine revision ab46186b24
    • Dart version 2.16.1
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/ankushlaxman/Library/Android/sdk
    • Platform android-32, build-tools 32.0.0
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • 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 11.0.11+0-b60-7772763)

[✓] VS Code (version 1.64.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.34.0

[✓] Connected device (2 available)
    • Android SDK built for arm64 (mobile) • emulator-5554 • android-arm64  •
      Android 10 (API 29) (emulator)
    • Chrome (web)                         • chrome        • web-javascript •
      Google Chrome 98.0.4758.109

[✓] HTTP Host Availability
    • All required HTTP hosts are available
```

</details>

<details>

<summary>Screenshots</summary>

iOS:

IOS             |  Android
:-------------------------:|:-------------------------:
<img src="https://user-images.githubusercontent.com/62204476/156036684-809589db-b188-4bdc-8c7d-91057f48691d.png" width ="250">  | <img src="https://user-images.githubusercontent.com/62204476/156036745-11b74667-8f28-422d-bd5c-013a2571e396.png" width ="300"> 


</details>