Add RandomUserTrait to retrieve random user for testing

- Implemented `getRandomUser` method to fetch a random user using `EntityManagerInterface`.
- Added support for random user retrieval by querying `User` entity repository.

src/Bundle/ChillMainBundle/Test/RandomUserTrait.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Test;
+
+use Chill\MainBundle\Entity\User;
+use Doctrine\ORM\EntityManagerInterface;
+
+trait RandomUserTrait
+{
+    public function getRandomUser(EntityManagerInterface $em): User
+    {
+        $userRepository = $em->getRepository(User::class);
+        $count = $userRepository->count([]);
+        $random = mt_rand(0, $count - 1);
+
+        return $em->createQuery('SELECT u FROM '.User::class.' u ')
+            ->setMaxResults(1)
+            ->setFirstResult($random)
+            ->getSingleResult();
+    }
+}