Fix ComponentPosition.componentGroup null FK in CwaFixtureBuilder

addComponentPosition() only populates the inverse-side collection; setting
the owning-side property directly is required for Doctrine to write the FK.

Author: silverbackdan

src/Fixture/CwaFixtureBuilder.php

@@ -422,7 +422,7 @@ private function createPositions(GroupBuilder $groupBuilder): bool
             $position = new ComponentPosition();
             $position->sortValue = $item['sort'];
             $position->component = $component;
-            $componentGroup->addComponentPosition($position);
+            $position->componentGroup = $componentGroup;
             $this->timestampedPersister->persistTimestampedFields($position, true);
             $this->persistWithAssociations($component);
             $this->manager->persist($position);
@@ -433,7 +433,7 @@ private function createPositions(GroupBuilder $groupBuilder): bool
             $position = new ComponentPosition();
             $position->sortValue = $item['sort'];
             $position->pageDataProperty = $item['property'];
-            $componentGroup->addComponentPosition($position);
+            $position->componentGroup = $componentGroup;
             $this->timestampedPersister->persistTimestampedFields($position, true);
             $this->manager->persist($position);
             $hasAny = true;