Revert "Remove unused callback from the ArcaneAuthenticationService during logout"

This reverts commit cdc44e8747.

lib/src/services/authentication/authentication_service.dart

@@ -103,7 +103,7 @@ class ArcaneAuthenticationService extends ArcaneService {
 
   /// Logs the current user out. Upon successful logout, `status` will be set to
   /// `AuthenticationStatus.unauthenticated`.
-  Future<void> logOut() async {
+  Future<void> logOut({required VoidCallback onLoggedOut}) async {
     if (_mocked) return;
     if (status == AuthenticationStatus.unauthenticated) return;
 
@@ -112,6 +112,7 @@ class ArcaneAuthenticationService extends ArcaneService {
     await loggedOut.fold(
       onSuccess: (_) async {
         setUnauthenticated();
+        onLoggedOut();
       },
       onError: (e) {
         throw Exception(e);