TASK: Code style adjust 5 internal usages of Object::none() to `::c…

…reateEmpty()`

We had the discussion again how to name an empty object and for normal collections we used `createEmpty()` in the past and should continue to do so. The use of `none()` snuck in lately via the subscription engine.

neos/neos-development-collection#5463 (comment)

Classes/Factory/SubscriptionStore/DoctrineSubscriptionStore.php

@@ -94,7 +94,7 @@ public function findByCriteriaForUpdate(SubscriptionCriteria $criteria): Subscri
         assert($result instanceof Result);
         $rows = $result->fetchAllAssociative();
         if ($rows === []) {
-            return Subscriptions::none();
+            return Subscriptions::createEmpty();
         }
         return Subscriptions::fromArray(array_map(self::fromDatabase(...), $rows));
     }