Resolve TMSS-666

Closes TMSS-666 There is a followup ticket TMSS-729 to kill the pipeline.

SAS/TMSS/backend/src/tmss/tmssapp/subtasks.py

@@ -759,11 +759,11 @@ def create_cleanup_subtask_from_task_blueprint(task_blueprint: TaskBlueprint) ->
     subtask_data = {"start_time": None,
                     "stop_time": None,
                     "state": SubtaskState.objects.get(value=SubtaskState.Choices.DEFINING.value),
-                    "task_blueprint": task_blueprint,
                     "specifications_template": subtask_template,
                     "specifications_doc": subtask_specs,
                     "cluster": Cluster.objects.get(name=cluster_name)}
     subtask = Subtask.objects.create(**subtask_data)
+    subtask.task_blueprints.set([task_blueprint])
 
     # step 2: create and link subtask input
     # for this cleanup subtask an 'input' seems a bit weird, but it actually makes sense!