Remove time obs

Project/Assets/ML-Agents/Examples/PushBlock/Prefabs/PushBlockCollabArea.prefab

   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    VectorObservationSize: 1
+    VectorObservationSize: 0
     NumStackedVectorObservations: 2
     m_ActionSpec:
       m_NumContinuousActions: 0
   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    VectorObservationSize: 1
+    VectorObservationSize: 0
     NumStackedVectorObservations: 2
     m_ActionSpec:
       m_NumContinuousActions: 0
   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    VectorObservationSize: 1
+    VectorObservationSize: 0
     NumStackedVectorObservations: 2
     m_ActionSpec:
       m_NumContinuousActions: 0

Project/Assets/ML-Agents/Examples/PushBlock/Scripts/PushAgentCollab.cs

             ForceMode.VelocityChange);
     }
 
-    public override void CollectObservations(VectorSensor sensor)
-    {
-        if (useVectorObs)
-        {
-            sensor.AddObservation(StepCount / (float)MaxStep);
-        }
-    }
 
     /// <summary>
     /// Called every step of the engine. Here the agent takes an action.