TASK: Move transactional logic _on_ projection as it does not belong …

…to the subscription store

... which technically only coincidentally uses the same connection and dbal instance

see neos/neos-development-collection#5321 (comment)

src/DoctrineDbalContentGraphProjection.php

@@ -62,6 +62,7 @@
 use Neos\ContentRepository\Core\Feature\WorkspaceRebase\Event\WorkspaceRebaseFailed;
 use Neos\ContentRepository\Core\Feature\WorkspaceRebase\Event\WorkspaceWasRebased;
 use Neos\ContentRepository\Core\Infrastructure\DbalSchemaDiff;
+use Neos\ContentRepository\Core\Infrastructure\ProjectionTransactionTrait;
 use Neos\ContentRepository\Core\NodeType\NodeTypeName;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentGraphProjectionInterface;
 use Neos\ContentRepository\Core\Projection\ContentGraph\ContentGraphReadModelInterface;
@@ -80,6 +81,8 @@
  */
 final class DoctrineDbalContentGraphProjection implements ContentGraphProjectionInterface
 {
+    use ProjectionTransactionTrait;
+
     use ContentStream;
     use NodeMove;
     use NodeRemoval;