[GCS] reply to the owner only after the actor has been successfully created. (#8079)

* reply to the owner only after the actor is successfully created.

* reply immediately if the actor is already created

* fix comment

* add test_actor_creation_task provided by @Stephanie Wang

Co-authored-by: senlin.zsl <senlin.zsl@antfin.com>

python/ray/tests/test_reference_counting.py

@@ -162,6 +162,29 @@ def test_dependency_refcounts(ray_start_regular):
     check_refcounts({})
 
 
+def test_actor_creation_task(ray_start_regular):
+    @ray.remote
+    def large_object():
+        # This will be spilled to plasma.
+        return np.zeros(10 * 1024 * 1024, dtype=np.uint8)
+
+    @ray.remote(resources={"init": 1})
+    class Actor:
+        def __init__(self, dependency):
+            return
+
+        def ping(self):
+            return
+
+    a = Actor.remote(large_object.remote())
+    ping = a.ping.remote()
+    ready, unready = ray.wait([ping], timeout=1)
+    assert not ready
+
+    ray.experimental.set_resource("init", 1)
+    ray.get(ping)
+
+
 def test_basic_pinning(one_worker_100MiB):
     @ray.remote
     def f(array):