fix(serializer): uriTemplate wrong cache usage in hal format (#6313)

* add failing test

* prevent components caching between different subresources

* fix tests for MongoDB

Author: usu

Serializer/ItemNormalizer.php

@@ -184,6 +184,7 @@ private function getComponents(object $object, ?string $format, array $context):
 
                     $relation['iri'] = $this->iriConverter->getIriFromResource($object, UrlGeneratorInterface::ABS_PATH, $operation, $childContext);
                     $relation['operation'] = $operation;
+                    $cacheKey = null;
                 }
 
                 if ($propertyMetadata->isReadableLink()) {
@@ -200,7 +201,7 @@ private function getComponents(object $object, ?string $format, array $context):
             }
         }
 
-        if (false !== $context['cache_key']) {
+        if ($cacheKey && false !== $context['cache_key']) {
             $this->componentsCache[$cacheKey] = $components;
         }