refactor(github): build GraphQL query without the client bundle

The eightpoints/guzzle-bundle and idci/graphql-client-bundle only
existed to build one near-static query string, and the bundle's own
HTTP transport was already bypassed in favor of Symfony HttpClient.
Build the query with sprintf/json_encode instead, drop both bundles
from config/bundles.php, and update the test double accordingly.

tests/Unit/Service/Provider/GitHubProviderTest.php

@@ -5,9 +5,6 @@ declare(strict_types=1);
 namespace App\Tests\Unit\Service\Provider;
 
 use App\Service\Provider\GitHubProvider;
-use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClient;
-use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClientRegistryInterface;
-use IDCI\Bundle\GraphQLClientBundle\Query\GraphQLQuery;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
@@ -23,22 +20,9 @@ final class GitHubProviderTest extends TestCase
         string $username = 'user',
         string $token = 'token',
         ?HttpClientInterface $client = null,
-        ?GraphQLApiClientRegistryInterface $registry = null,
     ): GitHubProvider {
-        if ($registry === null) {
-            $graphqlQuery = $this->createStub(GraphQLQuery::class);
-            $graphqlQuery->method('getGraphQLQuery')->willReturn('query {}');
-
-            $graphqlClient = $this->createStub(GraphQLApiClient::class);
-            $graphqlClient->method('buildQuery')->willReturn($graphqlQuery);
-
-            $registry = $this->createStub(GraphQLApiClientRegistryInterface::class);
-            $registry->method('get')->willReturn($graphqlClient);
-        }
-
         return new GitHubProvider(
             $client ?? $this->createStub(HttpClientInterface::class),
-            $registry,
             $username,
             $token,
             $this->createStub(LoggerInterface::class),