locomotion scenes: don't add dynamic target to the agent's hierarchy (#5226)

Project/Assets/ML-Agents/Examples/Crawler/Prefabs/Crawler.prefab

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Project/Assets/ML-Agents/Examples/Crawler/Scripts/CrawlerAgent.cs

     /// <param name="pos"></param>
     void SpawnTarget(Transform prefab, Vector3 pos)
     {
-        m_Target = Instantiate(prefab, pos, Quaternion.identity, transform);
+        m_Target = Instantiate(prefab, pos, Quaternion.identity, transform.parent);
     }
 
     /// <summary>

Project/Assets/ML-Agents/Examples/Worm/Scripts/WormAgent.cs

     /// <param name="pos"></param>
     void SpawnTarget(Transform prefab, Vector3 pos)
     {
-        m_Target = Instantiate(prefab, pos, Quaternion.identity, transform);
+        m_Target = Instantiate(prefab, pos, Quaternion.identity, transform.parent);
     }
 
     /// <summary>

Project/Assets/ML-Agents/Examples/Crawler/TFModels/Crawler.onnx.meta

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