Add quiz clearing and deletion functionality with UI enhancements

This commit introduces the ability to clear quiz results and delete quizzes directly from the backoffice. It includes new routes, controllers, modals for user confirmation, and updates to translations. The `QuizRepository` now supports dedicated methods for clearing results and deleting quizzes along with error handling. Related database migrations and front-end adjustments are also included.

src/Repository/QuizRepository.php

@@ -4,17 +4,59 @@ declare(strict_types=1);
 
 namespace App\Repository;
 
+use App\Entity\Elimination;
+use App\Entity\GivenAnswer;
 use App\Entity\Quiz;
+use App\Entity\QuizCandidate;
+use App\Exception\ErrorClearingQuizException;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
+use Psr\Log\LoggerInterface;
 
 /**
  * @extends ServiceEntityRepository<Quiz>
  */
 class QuizRepository extends ServiceEntityRepository
 {
-    public function __construct(ManagerRegistry $registry)
+    public function __construct(ManagerRegistry $registry, private readonly LoggerInterface $logger)
     {
         parent::__construct($registry, Quiz::class);
     }
+
+    /** @throws ErrorClearingQuizException */
+    public function clearQuiz(Quiz $quiz): void
+    {
+        $em = $this->getEntityManager();
+        $em->beginTransaction();
+        try {
+            $em->createQueryBuilder()
+                ->delete()->from(QuizCandidate::class, 'qc')
+                ->where('qc.quiz = :quiz')
+                ->setParameter('quiz', $quiz)
+                ->getQuery()->execute();
+
+            $em->createQueryBuilder()
+                ->delete()->from(GivenAnswer::class, 'ga')
+                ->where('ga.quiz = :quiz')
+                ->setParameter('quiz', $quiz)
+                ->getQuery()->execute();
+            $em->createQueryBuilder()
+                ->delete()->from(Elimination::class, 'e')
+                ->where('e.quiz = :quiz')
+                ->setParameter('quiz', $quiz)
+                ->getQuery()->execute();
+        } catch (\Throwable $throwable) {
+            $this->logger->error($throwable->getMessage());
+            $em->rollback();
+            throw new ErrorClearingQuizException(previous: $throwable);
+        }
+
+        $em->commit();
+    }
+
+    public function deleteQuiz(Quiz $quiz): void
+    {
+        $this->getEntityManager()->remove($quiz);
+        $this->getEntityManager()->flush();
+    }
 }