Add search functionality for user groups

Implemented `SearchUserGroupApiProvider` to handle user group search requests. Added `UserGroupRepository` and its interface to support search queries. Updated API specs to include user group as a searchable type.

src/Bundle/ChillMainBundle/Tests/Repository/UserGroupRepositoryTest.php

@@ -0,0 +1,50 @@
+<?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\Tests\Repository;
+
+use Chill\MainBundle\Repository\UserGroupRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class UserGroupRepositoryTest extends KernelTestCase
+{
+    private EntityManagerInterface $entityManager;
+
+    protected function setUp(): void
+    {
+        self::bootKernel();
+        $this->entityManager = static::getContainer()->get(EntityManagerInterface::class);
+
+    }
+
+    public function testProvideSearchApiQuery(): void
+    {
+        $repository = new UserGroupRepository($this->entityManager);
+
+        $apiQuery = $repository->provideSearchApiQuery('trav', 'fr');
+
+        // test that the query does works
+        $sql = $apiQuery->buildQuery();
+        $params = $apiQuery->buildParameters();
+
+        $result = $this->entityManager->getConnection()->executeQuery($sql, $params);
+        $results = $result->fetchAllAssociative();
+
+        self::assertIsArray($results);
+
+    }
+}