minor symfony#60934 [HttpKernel] Avoid memory leaks cache attribute, profiler listener (andrew-demb)

This PR was squashed before being merged into the 7.4 branch.

Discussion
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[HttpKernel] Avoid memory leaks cache attribute, profiler listener

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | no
| New feature?  | yes <!-- if yes, also update src/**/CHANGELOG.md -->
| Deprecations? | no <!-- if yes, also update UPGRADE-*.md and src/**/CHANGELOG.md -->
| Issues        |
| License       | MIT

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For the current moment, if the `onKernelTerminate` / `onKernelResponse` methods won't be called, the listener's state won't be reset between requests.

~~Please let me know if this should be considered as a new feature - to retarget PR to the 7.3 branch~~

~~Similar to PR symfony#60933~~

Commits
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4e203f0 [HttpKernel] Avoid memory leaks cache attribute, profiler listener

Author: nicolas-grekas

src/Symfony/Bundle/FrameworkBundle/Resources/config/profiling.php

@@ -39,6 +39,7 @@
                 param('profiler_listener.only_main_requests'),
             ])
             ->tag('kernel.event_subscriber')
+            ->tag('kernel.reset', ['method' => '?reset'])
 
         ->set('console_profiler_listener', ConsoleProfilerListener::class)
             ->args([

src/Symfony/Bundle/FrameworkBundle/Resources/config/web.php

@@ -146,6 +146,7 @@
 
         ->set('controller.cache_attribute_listener', CacheAttributeListener::class)
             ->tag('kernel.event_subscriber')
+            ->tag('kernel.reset', ['method' => '?reset'])
 
         ->set('controller.helper', ControllerHelper::class)
             ->tag('container.service_subscriber')

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

@@ -182,6 +182,12 @@ public static function getSubscribedEvents(): array
         ];
     }
 
+    public function reset(): void
+    {
+        $this->lastModified = new \SplObjectStorage();
+        $this->etags = new \SplObjectStorage();
+    }
+
     private function getExpressionLanguage(): ExpressionLanguage
     {
         return $this->expressionLanguage ??= class_exists(ExpressionLanguage::class)

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

@@ -129,8 +129,14 @@ public function onKernelTerminate(TerminateEvent $event): void
             $this->profiler->saveProfile($this->profiles[$request]);
         }
 
+        $this->reset();
+    }
+
+    public function reset(): void
+    {
         $this->profiles = new \SplObjectStorage();
         $this->parents = new \SplObjectStorage();
+        $this->exception = null;
     }
 
     public static function getSubscribedEvents(): array