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_CreateReparentAndDetachPrefab.py

@@ -0,0 +1,51 @@
+"""
+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_CreateReparentAndDetachPrefab():
+
+    CAR_PREFAB_FILE_NAME = 'car_prefab'
+    WHEEL_PREFAB_FILE_NAME = 'wheel_prefab'
+
+    import editor_python_test_tools.pyside_utils as pyside_utils
+
+    @pyside_utils.wrap_async
+    async def run_test():
+
+        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 car entity at the root level
+        car_entity = EditorEntity.create_editor_entity()
+        car_prefab_entities = [car_entity]
+
+        # Creates a prefab from the car entity
+        _, car = Prefab.create_prefab(
+            car_prefab_entities, CAR_PREFAB_FILE_NAME)
+
+        # Creates another new wheel entity at the root level
+        wheel_entity = EditorEntity.create_editor_entity()
+        wheel_prefab_entities = [wheel_entity]
+
+        # Creates another prefab from the wheel entity
+        _, wheel = Prefab.create_prefab(
+            wheel_prefab_entities, WHEEL_PREFAB_FILE_NAME)
+
+        # Reparents the wheel prefab instance to the container entity of the car prefab instance
+        await wheel.ui_reparent_prefab_instance(car.container_entity.id)
+
+        # Detaches the wheel prefab instance
+        Prefab.detach_prefab(wheel)
+
+    run_test()
+
+if __name__ == "__main__":
+    from editor_python_test_tools.utils import Report
+    Report.start_test(PrefabBasicWorkflow_CreateReparentAndDetachPrefab)