Fix prefab/instance name inconsistency issue in automated testing's prefab utils (#7122)

* Ensure to fire OnEditorEntityCreated notification in SandboxIntegrationManager::CreateNewEntityAtPosition

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Ensure to fire OnEditorEntityCreated notification in SandboxIntegrationManager::CreateNewEntityAtPosition

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* convert test AreaNodes_DependentComponentsAdded to use prefab system

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Prevent SetupEditorEntity being called twice

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Fix prefab utils prefab naming issue

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* revert test changes

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* fix a grammatical error

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

AutomatedTesting/Gem/PythonTests/Prefab/tests/create_prefab/CreatePrefab_UnderAnEntity.py

@@ -13,7 +13,8 @@ def CreatePrefab_UnderAnEntity():
     Test is successful if the new instanced prefab of the child has the parent entity id
     """
 
-    CAR_PREFAB_FILE_NAME = 'car_prefab'
+    from pathlib import Path
+    CAR_PREFAB_FILE_NAME = Path(__file__).stem + 'car_prefab'
 
     from editor_python_test_tools.editor_entity_utils import EditorEntity
     from editor_python_test_tools.prefab_utils import Prefab

AutomatedTesting/Gem/PythonTests/Prefab/tests/create_prefab/CreatePrefab_WithSingleEntity.py

@@ -7,7 +7,8 @@ SPDX-License-Identifier: Apache-2.0 OR MIT
 
 def CreatePrefab_WithSingleEntity():
 
-    CAR_PREFAB_FILE_NAME = 'car_prefab'
+    from pathlib import Path
+    CAR_PREFAB_FILE_NAME = Path(__file__).stem + 'car_prefab'
 
     from editor_python_test_tools.editor_entity_utils import EditorEntity
     from editor_python_test_tools.utils import Report