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/modules/workflow-engine-redis/integration-tests/utils/database.ts

@@ -33,7 +33,7 @@ async function deleteKeysByPattern(pattern) {
   for await (const keys of stream) {
     if (keys.length) {
       const pipeline = redis.pipeline()
-      keys.forEach((key) => pipeline.del(key))
+      keys.forEach((key) => pipeline.unlink(key))
       await pipeline.exec()
     }
   }