This test case tries to provide message helpful for debugging in case
of assertion failure for assertUserCanPassWorkflowTransition, but
this was not correctly using new workflow API and in case of failure
there was an error like this:

  File ".../custom/test.py"
    self.assertUserCanPassWorkflowTransition(user, 'stop_action', packing_list)
  File "product/ERP5Type/tests/SecurityTestCase.py", line 237, in failUnlessUserCanPassWorkflowTransition
    if wf_transition.trigger_type == TRIGGER_USER_ACTION:
AttributeError: 'NoneType' object has no attribute 'trigger_type'

The previous implementation was using getGuardSummary, which no
longer exist in new workflow, so we implement similar logic here.

The new message changes a bit, it now look like this:

    AssertionError: User X can NOT pass stop_action transition on Internal Packing List at /erp5/internal_packing_list_module/20220218-22A38 (draft on delivery_causality_workflow, draft on internal_packing_list_notification_workflow, started on packing_list_workflow).
     Roles: [Owner, Member, Authenticated, Associate]
     Available transitions:
              deliver_action[packing_list_workflow]
                    Expression:
                    Permissions:
                    Groups:
            * stop_action[packing_list_workflow]
                    Expression: python: not(state_change['object'].getPortalType() == "Sale Packing List" and state_change['object'].getSimulationState() == "confirmed")
                    Permissions:
                    Groups: