[core] Fix losing task state when giving up forward task. (#7525)

* fix NodeManager::Forward task bug on error

* fix lint

* revert spillback task forward

src/ray/raylet/node_manager.cc

@@ -2962,6 +2962,7 @@ void NodeManager::ForwardTask(
   if (worker_pool_.HasPendingWorkerForTask(spec.GetLanguage(), task_id)) {
     // There is a worker being starting for this task,
     // so we shouldn't forward this task to another node.
+    on_error(ray::Status::Invalid("Already has pending worker for this task"), task);
     return;
   }