feat: email the administrators when a role nomination appears

tests/Dashboard/PendingRoleApprovalsWidgetProviderTest.php

@@ -8,6 +8,7 @@ use App\Dashboard\Widget\PendingRoleApprovalsWidgetProvider;
 use App\Entity\User;
 use App\Repository\UserRepository;
 use App\Security\Role;
+use App\Service\RoleApprovalUrlGenerator;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
@@ -76,6 +77,10 @@ class PendingRoleApprovalsWidgetProviderTest extends TestCase
             },
         );
 
-        return new PendingRoleApprovalsWidgetProvider($repository, $urlGenerator);
+        return new PendingRoleApprovalsWidgetProvider(
+            $repository,
+            $urlGenerator,
+            new RoleApprovalUrlGenerator($urlGenerator),
+        );
     }
 }