Added scenarios/utils for feature: manually cease a subject

Author: Andyg79

pytest.ini

@@ -45,3 +45,4 @@ markers =
     subject_search: tests that are part of the subject search test suite
     investigation_dataset_tests: tests that are part of the investigation dataset test suite
     skip_before_test: tests that will not use the before_test fixture
+    manual_cease: tests that are part of the manual cease test suite