AuthException from auth.getSessionFromUrl() does not contain error code.

[superakabo]

Describe the bug
When a password reset link or similar link expires an AuthException(message: Email link is invalid or has expired, statusCode: null) is thrown. The AuthException should have a non-null statusCode because the processed auth url contains an error code (error_code=403) as part of its query parameters.

To Reproduce
Steps to reproduce the behavior:

1. Request a password reset link via email using the Supabase Flutter SDK by executing

 Supabase.instance.client.auth.resetPasswordForEmail(
          '[email protected]',
          redirectTo: 'https://my_deep_link.com/password-reset',
     );

2. Tap on the "Reset Password" link twice from your email.
3. Check your IDE console logs to see the error.

Alternatively, if you have an existing expired processed auth url, you can execute

 AuthSessionUrlResponse response = await Supabase.instance.client.auth.getSessionFromUrl(
                        Uri.parse(
                            'https://example.com/reset-password?error=access_denied&error_code=403&error_description=Email+link+is+invalid+or+has+expired#error=access_denied&error_code=403&error_description=Email+link+is+invalid+or+has+expired'),
                        storeSession: false,
               );

Expected behavior
The AuthException thrown should be

AuthException(message: "Email link is invalid or has expired", statusCode: "403");

Version (please complete the following information):
Dart SDK 3.4.0
Flutter SDK 3.22.0
myapp 1.0.0+1

├── supabase_flutter 2.5.6
│ ├── supabase 2.2.2
│ │ ├── functions_client 2.2.0
│ │ ├── gotrue 2.8.1
│ │ ├── postgrest 2.1.2
│ │ ├── realtime_client 2.1.0
│ │ ├── storage_client 2.0.2

Additional context
From the source code (src/supabase_auth.dart),
it seems an omission was made around line 760:
"GoTrueClient.getSessionFromUrl (package:gotrue/src/gotrue_client.dart:760:7)"

final errorDescription = url.queryParameters['error_description'];
    if (errorDescription != null) {
      throw AuthException(errorDescription);
    }

it could be

    final errorCode = url.queryParameters['error_code'];
    final errorDescription = url.queryParameters['error_description'];
    if (errorDescription != null) {
      throw AuthException(errorDescription, statusCode: errorCode);
    }

Making this change is non-breaking.