fix iteration restart

Call OnIterationEnd for randomizers that have already started when we restart the Iteration

com.unity.perception/Runtime/Randomization/Scenarios/ScenarioBase.cs

                 return;
             }
 
+            var randomizersStartedThisIteration = new List<Randomizer>();
             // Perform new iteration tasks
             if (currentIterationFrame == 0)
             {
                     foreach (var randomizer in activeRandomizers)
                     {
                         randomizer.IterationStart();
+                        randomizersStartedThisIteration.Add(randomizer);
+                        {
+                            foreach (var rand in randomizersStartedThisIteration)
+                            {
+                                rand.IterationEnd();
+                            }
+                            randomizersStartedThisIteration.Clear();
+                        }
 
                         if (m_ShouldDelayIteration)
                         {