…ntent (#149130)" (flutter/flutter#149333)

…lutter#149130)" (flutter#149333)

Reverts: flutter#149130
Initiated by: Piinks
Reason for reverting: Google testing did not run on this PR and multiple semantics screen shots from internal testing look incorrect. 
Original PR Author: TahaTesser

Reviewed By: {goderbauer}

This change reverts the following previous change:
fixes [AlertDialog content semantics merged](flutter#147574)

### Code sample

<details>
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @OverRide
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      // showSemanticsDebugger: true,
      home: Scaffold(
        body: SafeArea(
          child: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: <Widget>[
                const Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text('Some text'),
                    Text('More text'),
                  ],
                ),
                Builder(builder: (BuildContext context) {
                  return ElevatedButton(
                    onPressed: () {
                      showDialog<void>(
                        context: context,
                        builder: (BuildContext context) {
                          return AlertDialog(
                            title: const Text('Dialog Title'),
                            content: const Column(
                              children: <Widget>[
                                Text('Some text'),
                                Text('More text'),
                              ],
                            ),
                            actions: <Widget>[
                              TextButton(
                                onPressed: () {
                                  Navigator.of(context).pop();
                                },
                                child: const Text('Close'),
                              ),
                            ],
                          );
                        },
                      );
                    },
                    child: const Text('Open Dialog'),
                  );
                }),
              ],
            ),
          ),
        ),
      ),
    );
  }
}
```

</details>

### Before vs After

![Screenshot 2024-05-27 at 14 59 57](https://github.com/flutter/flutter/assets/48603081/3b231a7a-db71-4dbf-bd4a-dd44a537cae8)

![Screenshot 2024-05-27 at 14 56 04](https://github.com/flutter/flutter/assets/48603081/219c1de5-ad35-49b3-a80f-4f036184e22b)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)

…ntent (#149130)" (flutter/flutter#149333)