fix: only load profiler services when Symfony profiler is available

The profiler.yaml was loaded unconditionally, causing GraphQLCollector's
event listener to run on every GraphQL request in production. This
performed unnecessary query parsing and deep-cloning of results/variables
that were never read.

Author: martiis

src/DependencyInjection/OverblogGraphQLExtension.php

@@ -86,7 +86,10 @@ private function loadConfigFiles(ContainerBuilder $container): void
         $loader->load('expression_language_functions.yaml');
         $loader->load('definition_config_processors.yaml');
         $loader->load('aliases.yaml');
-        $loader->load('profiler.yaml');
+
+        if ($container->has('profiler')) {
+            $loader->load('profiler.yaml');
+        }
     }
 
     private function registerForAutoconfiguration(ContainerBuilder $container): void