TASK: Runtime remove magic fusion jsonSerialize again

The Neos `FusionView` is forward compatible for this change neos/flow-development-collection#3286
Assign should be used for setting the request:
```
$view->assign('request"', $this->request)
```

Neos.Neos/Classes/View/FusionView.php

@@ -18,6 +18,8 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\Node;
 use Neos\ContentRepositoryRegistry\ContentRepositoryRegistry;
 use Neos\Flow\Annotations as Flow;
+use Neos\Flow\Mvc\ActionRequest;
+use Neos\Flow\Mvc\Controller\ControllerContext;
 use Neos\Flow\Mvc\View\AbstractView;
 use Neos\Flow\Security\Context;
 use Neos\Fusion\Core\FusionGlobals;
@@ -52,6 +54,12 @@ class FusionView extends AbstractView
     #[Flow\Inject]
     protected RenderingModeService $renderingModeService;
 
+    /**
+     * Via {@see assign} request using the "request" key,
+     * will be available also as Fusion global in the runtime.
+     */
+    protected ?ActionRequest $assignedActionRequest = null;
+
     /**
      * Renders the view
      *
@@ -196,10 +204,10 @@ protected function getFusionRuntime(Node $currentSiteNode)
 
             $renderingMode = $this->renderingModeService->findByName($this->getOption('renderingModeName'));
 
-            $fusionGlobals = FusionGlobals::fromArray([
-                'request' => $this->controllerContext->getRequest(),
+            $fusionGlobals = FusionGlobals::fromArray(array_filter([
+                'request' => $this->assignedActionRequest,
                 'renderingMode' => $renderingMode
-            ]);
+            ]));
             $this->fusionRuntime = $this->runtimeFactory->createFromConfiguration(
                 $fusionConfiguration,
                 $fusionGlobals
@@ -220,7 +228,30 @@ protected function getFusionRuntime(Node $currentSiteNode)
      */
     public function assign($key, $value): AbstractView
     {
+        if ($key === 'request') {
+            // the request cannot be used as "normal" fusion variable and must be treated as FusionGlobal
+            // to for example not cache it accidentally
+            // additionally we need it for special request based handling in the view
+            $this->assignedActionRequest = $value;
+            return $this;
+        }
         $this->fusionRuntime = null;
         return parent::assign($key, $value);
     }
+
+    /**
+     * Legacy layer to set the request for this view if not set already.
+     *
+     * Please use {@see assign} with "request" instead
+     *
+     *     $view->assign('request"', $this->request)
+     *
+     * @deprecated with Neos 9
+     */
+    public function setControllerContext(ControllerContext $controllerContext)
+    {
+        if (!$this->assignedActionRequest) {
+            $this->assignedActionRequest = $controllerContext->getRequest();
+        }
+    }
 }