Fix broken tests (#951)

Summary:
Pull Request resolved: #951

D80505166 broke some tests. We need to provide a python implementation for `Instance.proc_id`. Additionally, there was a bad assert about `_controller_controller` not being none; we need to handle the case where the `_Actor` being initialized is `_ControllerController`.
ghstack-source-id: 304712948
exported-using-ghexport

Reviewed By: zdevito

Differential Revision: D80725768

fbshipit-source-id: b64dff2b3b17ab1f2fdcab9c563f2e85bbc1750b

Author: samlurye

python/monarch/_src/actor/actor_mesh.py

@@ -134,7 +134,7 @@ def proc_id(self) -> str:
         """
         The proc_id of the current actor.
         """
-        ...
+        return self.actor_id.proc_id
 
     @property
     def actor_id(self) -> ActorId:
@@ -775,6 +775,12 @@ async def handle(
             match method:
                 case MethodSpecifier.Init():
                     Class, self._proc_mesh, self._controller_controller, *args = args
+                    if self._controller_controller is not None:
+                        ctx.actor_instance._controller_controller = (
+                            self._controller_controller
+                        )
+                    assert self._proc_mesh is not None
+                    ctx.actor_instance.proc_mesh = self._proc_mesh
                     try:
                         self.instance = Class(*args, **kwargs)
                     except Exception as e:
@@ -808,8 +814,8 @@ async def handle(
                         f" This is likely due to an earlier error: {self._saved_error}"
                     )
                 raise AssertionError(error_message)
-            assert self._controller_controller is not None
-            ctx.actor_instance._controller_controller = self._controller_controller
+            if self._controller_controller is not None:
+                ctx.actor_instance._controller_controller = self._controller_controller
             assert self._proc_mesh is not None
             ctx.actor_instance.proc_mesh = self._proc_mesh
             the_method = getattr(self.instance, method_name)