workflows: cascading deletion
- NOTE Adds cascading deletion of BibWorkflowObjects and logs when deleting a Workflow.
- Takes advantage of the cascading deletes in test tearDown functions - removing the unneeded test_teardown() function.
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>