fix passing manager id to trainer

com.unity.ml-agents/Runtime/Communicator/GrpcExtensions.cs

                 agentInfoProto.ActionMask.AddRange(ai.discreteActionMasks);
             }
 
-            if (ai.teamManagerId != null)
-            {
-                agentInfoProto.TeamManagerId = ai.teamManagerId;
-            }
-
             return agentInfoProto;
         }
 

ml-agents/mlagents/trainers/agent_processor.py

     ) -> None:
         stored_decision_step, idx = self.last_step_result.get(global_id, (None, None))
         if stored_decision_step is not None:
-            if step.team_manager_id is not None:
+            if step.team_manager_id > 0:
                 self.last_group_obs[step.team_manager_id][
                     global_id
                 ] = stored_decision_step.obs
-        for _manager_id, _team_group in self.current_group_obs.items():
+        for _manager_id in list(self.current_group_obs.keys()):
+            _team_group = self.current_group_obs[_manager_id]
-                self._safe_delete(_team_group, _manager_id)
-        for _manager_id, _team_group in self.last_group_obs.items():
+                self._safe_delete(self.current_group_obs, _manager_id)
+        for _manager_id in list(self.last_group_obs.keys()):
+            _team_group = self.last_group_obs[_manager_id]
-                self._safe_delete(_team_group, _manager_id)
+                self._safe_delete(self.last_group_obs, _manager_id)
 
     def _process_step(
         self, step: Union[TerminalStep, DecisionStep], global_id: str, index: int