adding the testing files for testing for python asset building and scripting

the scene_api gets a small update for mesh_group_add_advanced_coordinate_system(self,

AutomatedTesting/Gem/PythonTests/PythonAssetBuilder/bootstrap_tests.py

@@ -0,0 +1,17 @@
+"""
+All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+its licensors.
+
+For complete copyright and license terms please see the LICENSE at the root of this
+distribution (the "License"). All use of this software is governed by the License,
+or, if provided, by the license below or the license accompanying this file. Do not
+remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+"""
+import os
+import sys
+try:
+    sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+    import mock_asset_builder
+except:
+    print ('skipping asset builder testing via mock_asset_builder')