chore(): Prevent sub workflow events release early + redis unlink (#11641)

**What**
- Prevent event release when a workflow is run as step and finish
- Use `unlink` instead of `del` when removing keys from redist to push the execution to async thread

packages/core/workflows-sdk/src/helper/workflow-export.ts

@@ -93,7 +93,9 @@ function createContextualWorkflowRunner<
 
     const { eventGroupId, parentStepIdempotencyKey } = context
 
-    attachOnFinishReleaseEvents(events, flow, { logOnError })
+    if (!parentStepIdempotencyKey) {
+      attachOnFinishReleaseEvents(events, flow, { logOnError })
+    }
 
     const flowMetadata = {
       eventGroupId,