Fixed NvCloth assets, NvCloth automated test scripts, ModelAsset cloning and UI reverse overrides menu crash (#3851)

- Fixed cloth asset, which stopped working due to Updated skeleton logic: #2957 which changes how fbx graph nodes are collected (affecting its names, which is used by cloth modifier).
- Fixed cloth test suite active call to base's run_test function. It stopped working when its signature was changed here: 182d410#diff-3f5d93b0a76c838893693f19f2eacfe3e67040d445d6463c5c425ef5075cb409
- Renamed nvcloth TestSuite_Active.py to TestSuite_Main.py to be consistent with the other test folders.
- Fixed ModelAsset creator clone function. It was missing to copy the material slots, ultimately causing Material Component to show 0 material slots.
- Fixed crash where the revert overrides menu was not created when checking changes for selected component and selected entities.

Signed-off-by: moraaar moraaar@amazon.com

AutomatedTesting/Gem/PythonTests/NvCloth/C18977330_NvCloth_AddClothSimulationToActor.py

@@ -44,11 +44,7 @@ def C18977330_NvCloth_AddClothSimulationToActor():
     
     from editor_python_test_tools.editor_entity_utils import EditorEntity
     from editor_python_test_tools.utils import Report
-    
-    # Helper file Imports
-    import ImportPathHelper as imports
 
-    imports.init()
     from editor_python_test_tools.utils import TestHelper as helper
     from editor_python_test_tools.utils import Tracer
     
@@ -84,7 +80,5 @@ def C18977330_NvCloth_AddClothSimulationToActor():
     helper.close_editor()
 
 if __name__ == "__main__":
-    import ImportPathHelper as imports
-    imports.init()
     from editor_python_test_tools.utils import Report
     Report.start_test(C18977330_NvCloth_AddClothSimulationToActor)