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/TestSuite_Main.py

@@ -0,0 +1,32 @@
+"""
+Copyright (c) Contributors to the Open 3D Engine Project.
+For complete copyright and license terms please see the LICENSE at the root of this distribution.
+
+SPDX-License-Identifier: Apache-2.0 OR MIT
+
+"""
+
+# This suite consists of all test cases that are passing and have been verified.
+
+import pytest
+import os
+import sys
+
+from ly_test_tools import LAUNCHERS
+sys.path.append(os.path.dirname(os.path.abspath(__file__)) + '/../automatedtesting_shared')
+
+from base import TestAutomationBase
+
+@pytest.mark.parametrize("launcher_platform", ['windows_editor'])
+@pytest.mark.parametrize("project", ["AutomatedTesting"])
+class TestAutomation(TestAutomationBase):
+
+    use_null_renderer = False  # Use default renderer (needs gpu)
+
+    def test_C18977329_NvCloth_AddClothSimulationToMesh(self, request, workspace, editor, launcher_platform):
+        from . import C18977329_NvCloth_AddClothSimulationToMesh as test_module
+        self._run_test(request, workspace, editor, test_module, use_null_renderer = self.use_null_renderer)
+
+    def test_C18977330_NvCloth_AddClothSimulationToActor(self, request, workspace, editor, launcher_platform):
+        from . import C18977330_NvCloth_AddClothSimulationToActor as test_module
+        self._run_test(request, workspace, editor, test_module, use_null_renderer = self.use_null_renderer)