Add WopiConverter service and update Collabora integration tests

Introduce the WopiConverter service to handle document-to-PDF conversion using Collabora Online. Extend and update related tests in WopiConvertToPdfTest and ConvertControllerTest for better coverage and reliability. Enhance the GitLab CI configuration to exclude new test category "collabora-integration".

src/Bundle/ChillWopiBundle/tests/Service/WopiConvertToPdfTest.php

@@ -0,0 +1,63 @@
+<?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\WopiBundle\Tests\Service;
+
+use Chill\WopiBundle\Service\WopiConverter;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
+use Symfony\Component\HttpClient\HttpClient;
+use Symfony\Component\HttpClient\MockHttpClient;
+use Symfony\Component\HttpClient\Response\MockResponse;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class WopiConvertToPdfTest extends TestCase
+{
+    /**
+     * @group collabora-integration
+     */
+    public function testConvertToPdfWithRealServer(): void
+    {
+        $content = file_get_contents(__DIR__.'/fixtures/test-document.odt');
+
+        $client = HttpClient::create();
+        $parameters = new ParameterBag([
+            'wopi' => ['server' => $_ENV['EDITOR_SERVER']],
+        ]);
+
+        $converter = new WopiConverter($client, new NullLogger(), $parameters);
+
+        $actual = $converter->convert('fr', $content, 'application/vnd.oasis.opendocument.text');
+
+        self::assertIsString($actual);
+    }
+
+    public function testConvertToPdfWithMock(): void
+    {
+        $httpClient = new MockHttpClient([
+            new MockResponse('1234', ['http_code' => 200]),
+        ], 'http://collabora:9980');
+        $parameters = new ParameterBag([
+            'wopi' => ['server' => 'http://collabora:9980'],
+        ]);
+
+        $converter = new WopiConverter($httpClient, new NullLogger(), $parameters);
+
+        $actual = $converter->convert('fr', 'content-string', 'application/vnd.oasis.opendocument.text');
+
+        self::assertEquals('1234', $actual);
+    }
+}