Test-Scenario 'scenarios.astm.utm.DownUSS' creates Message: 'PlanningActivityResponse' object has no attribute 'result'

[rrosenbauer]

When we are execution the Scenario scenarios.astm.utm.DownUSS the Qualifier always stops execution in Step 'Tested USS attempts to plan Flight 1' with error:
`
AttributeError at 2024-07-15T07:51:00.370894Z
Message: 'PlanningActivityResponse' object has no attribute 'result'

Stack trace:
Traceback (most recent call last):
File "/app/monitoring/uss_qualifier/suites/suite.py", line 158, in _run_test_scenario
scenario.run(context)
File "/app/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.py", line 128, in run
self._plan_flight_conflict_planned()
File "/app/monitoring/uss_qualifier/scenarios/astm/utm/off_nominal_planning/down_uss.py", line 270, in _plan_flight_conflict_planned
msg = f"{self.tested_uss.participant_id} indicated {resp.result}"
^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/implicitdict/init.py", line 156, in getattribute
return super(ImplicitDict, self).getattribute(item)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PlanningActivityResponse' object has no attribute 'result'
`

I've already checked the main branch and the wrong line still exists and we would be happy if this can be fixed.