Add Detach and Duplicate Prefab basic workflow auto test (#4506)

- Add a new automated test PrefabBasicWorkflow_CreateReparentAndDetachPrefab for verifying prefab detachment basic workflow.
- Add a new automated test PrefabBasicWorkflow_CreateAndDuplicatePrefab for verifying prefab detachment basic workflow.
- Fix a bug related to sets of entity ids in Reparent helper function .

AutomatedTesting/Gem/PythonTests/Prefab/tests/PrefabBasicWorkflow_CreateAndDuplicatePrefab.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
+"""
+
+def PrefabBasicWorkflow_CreateAndDuplicatePrefab():
+
+    CAR_PREFAB_FILE_NAME = 'car_prefab'
+
+    from editor_python_test_tools.editor_entity_utils import EditorEntity
+    from editor_python_test_tools.prefab_utils import Prefab
+
+    import PrefabTestUtils as prefab_test_utils
+
+    prefab_test_utils.open_base_tests_level()
+
+    # Creates a new entity at the root level
+    car_entity = EditorEntity.create_editor_entity()
+    car_prefab_entities = [car_entity]
+
+    # Creates a prefab from the new entity
+    _, car = Prefab.create_prefab(
+        car_prefab_entities, CAR_PREFAB_FILE_NAME)
+
+    # Duplicates the prefab instance
+    Prefab.duplicate_prefabs([car])
+
+if __name__ == "__main__":
+    from editor_python_test_tools.utils import Report
+    Report.start_test(PrefabBasicWorkflow_CreateAndDuplicatePrefab)