merged branch tyx/fix/form-profiling (PR symfony#9137)

This PR was merged into the master branch.

Discussion
----------

[Form] form_debug.xml should be loaded only if form config is enabled

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |  -
| License       | MIT
| Doc PR        | -

Explication here:
symfony@1972a91#commitcomment-4187567

Commits
-------

b668e24 form_debug.xml should be loaded only if form config is enabled

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -30,6 +30,8 @@
  */
 class FrameworkExtension extends Extension
 {
+    private $formConfigEnabled = false;
+
     /**
      * Responds to the app.config configuration parameter.
      *
@@ -90,6 +92,7 @@ public function load(array $configs, ContainerBuilder $container)
         }
 
         if ($this->isConfigEnabled($container, $config['form'])) {
+            $this->formConfigEnabled = true;
             $this->registerFormConfiguration($config, $container, $loader);
             $config['validation']['enabled'] = true;
         }
@@ -218,7 +221,10 @@ private function registerProfilerConfiguration(array $config, ContainerBuilder $
             return;
         }
 
-        $loader->load('form_debug.xml');
+        if (true === $this->formConfigEnabled) {
+            $loader->load('form_debug.xml');
+        }
+        
         $loader->load('profiling.xml');
         $loader->load('collectors.xml');