moved synthdet specidic label config and labeling logic out of this repo

com.unity.perception/Runtime/GroundTruth/Labeling/LabelManager.cs

         /// </summary>
         public IEnumerable<Labeling> registeredLabels => m_RegisteredLabels;
 
-        public List<string> LabelStringsForAutoLabelConfig { get; } = new List<string>();
-
-        public void AddLabelStringToAutoLabelConfigList(string label)
-        {
-            if(!LabelStringsForAutoLabelConfig.Contains(label))
-                LabelStringsForAutoLabelConfig.Add(label);
-        }
-
         /// <summary>
         /// Registers all pending labels.
         /// Called once per frame during LateUpdate by the <see cref="PerceptionUpdater"/>.

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

         /// <inheritdoc/>
         protected override void OnUpdate()
         {
-            if (m_PerceptionCamera && currentIterationFrame == constants.framesPerIteration - 1
-            && currentIteration > 1)
+            if (m_PerceptionCamera && currentIterationFrame == constants.framesPerIteration - 1)
             {
                 m_PerceptionCamera.RequestCapture();
             }