Added an assert to verify AP and AP Batch close on teardown. (#5891)

* Added an assert to verify AP and AP Batch close on teardown.

Signed-off-by: Rosario Cox <lesaelr@amazon.com>

* Removed ".exe" from assert to ensure it works on any platform
Fixed missing set of parenthesis in the assert
Added "AssetBuilder" to the assert to ensure assetbuilders have closed correctly

Signed-off-by: Rosario Cox <lesaelr@amazon.com>

* Moving the helper function from asset_processor_fixture to asset_processor_utils.
Changed individual process_utils calls into a single call with a list.

Signed-off-by: Rosario Cox <lesaelr@amazon.com>

* Added the missing references.

Signed-off-by: Rosario Cox <lesaelr@amazon.com>

AutomatedTesting/Gem/PythonTests/assetpipeline/ap_fixtures/asset_processor_fixture.py

@@ -15,6 +15,7 @@ import logging
 
 # Import LyTestTools
 import ly_test_tools.o3de.asset_processor as asset_processor_commands
+import ly_test_tools.o3de.asset_processor_utils
 
 logger = logging.getLogger(__name__)
 
@@ -36,5 +37,8 @@ def asset_processor(request: pytest.fixture, workspace: pytest.fixture) -> asset
         ap.stop()
 
     request.addfinalizer(teardown)
+    for n in ly_test_tools.o3de.asset_processor_utils.processList:
+        assert not ly_test_tools.o3de.asset_processor_utils.check_ap_running(n), f"{n} process did not shutdown correctly."
+
 
     return ap