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.

migrations/Version20250607154730.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20250607154730 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql(<<<'SQL'
+            ALTER TABLE season DROP CONSTRAINT FK_F0E45BA96706D6B
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE season ADD CONSTRAINT FK_F0E45BA96706D6B FOREIGN KEY (active_quiz_id) REFERENCES quiz (id) ON DELETE SET NULL NOT DEFERRABLE INITIALLY IMMEDIATE
+        SQL);
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql(<<<'SQL'
+            ALTER TABLE season DROP CONSTRAINT fk_f0e45ba96706d6b
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE season ADD CONSTRAINT fk_f0e45ba96706d6b FOREIGN KEY (active_quiz_id) REFERENCES quiz (id) NOT DEFERRABLE INITIALLY IMMEDIATE
+        SQL);
+    }
+}