bug #36838 [HttpKernel] Bring back the debug toolbar (derrabus)

This PR was merged into the 4.4 branch.

Discussion
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[HttpKernel] Bring back the debug toolbar

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #36836
| License       | MIT
| Doc PR        | N/A

This PR effectively reverts #36789 in order to fix a regression caused by that PR.

Commits
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9f8d225 Revert "Change priority of KernelEvents::RESPONSE subscriber"

src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php

@@ -119,7 +119,7 @@ public function onKernelTerminate(PostResponseEvent $event)
     public static function getSubscribedEvents()
     {
         return [
-            KernelEvents::RESPONSE => ['onKernelResponse', -1012],
+            KernelEvents::RESPONSE => ['onKernelResponse', -100],
             KernelEvents::EXCEPTION => ['onKernelException', 0],
             KernelEvents::TERMINATE => ['onKernelTerminate', -1024],
         ];