firebase_auth_desktop throws UnimplementedError on tenantId

[Kazade]

Bug report

Describe the bug

Firebase's User.toString() method looks like this:

  @override
  String toString() {
    return '$User('
        'displayName: $displayName, '
        'email: $email, '
        'emailVerified: $emailVerified, '
        'isAnonymous: $isAnonymous, '
        'metadata: $metadata, '
        'phoneNumber: $phoneNumber, '
        'photoURL: $photoURL, '
        'providerData, $providerData, '
        'refreshToken: $refreshToken, '
        'tenantId: $tenantId, '   // <<<<< Note!
        'uid: $uid)';
  }

This calls tenantId from the user in firebase_auth_desktop, which forwards to the user from firebase_auth_dart where tenantId is unimplemented:

  /// The current user's tenant ID.
  ///
  /// This is a read-only property, which indicates the tenant ID used to sign in
  /// the current user.
  /// This is null if the user is signed in from the parent project.
  String? get tenantId => throw UnimplementedError();

Steps to reproduce

Steps to reproduce the behavior:

1. Call User.toString() on a Firebase User

Expected behavior

The toString() method should work and tenantId should appear.

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[✓] Flutter (Channel stable, 2.10.5, on Fedora Linux 37 (Workstation Edition) 6.0.16-300.fc37.x86_64, locale en_GB.UTF-8)
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