Add new cleanup task

Add a new cleanup task that will remove all past runs of task_clean_up_tasks and task_clean_old_task, which are not interesting yet take up 99.999% of the task history page.

gso/services/processes.py

@@ -5,7 +5,7 @@ or inconsistent when not careful. These methods are related to operations regard
 """
 
 from orchestrator.db import ProcessTable, WorkflowTable, db
-from orchestrator.devtools.populator import UUIDstr
+from orchestrator.types import UUIDstr
 from orchestrator.workflow import ProcessStatus
 from sqlalchemy import ScalarResult, or_, select