[uss_qualifier] scenario config: fix message_signing and validate qua…

…lifier run

This PR:
 - introduces a `validation` block to the `message_signing` configuration, so that we may more easily detect errors
 - adds a separate `FlightIntentsResource` that contains conflicting flights that all share the `0` priority
 - use the above new resource to fix `message_signing`, as what is tested by `message_signing` does not support different priorities

Test Plan:
I started by introducing the validation, which correctly detected the failure.

Introducing the new resource then fixed the problem, and a run of `./run_locally.sh configurations.dev.message_signing` then succeeded.

monitoring/uss_qualifier/configurations/dev/message_signing.yaml

@@ -48,14 +48,15 @@ v1:
  action:
  test_suite:
  suite_type: suites.faa.uft.message_signing
+ # Note: suite cannot currently accept flights that conflict due to different priorities,
+ # which is why priority_preemption_flights is not populated here.
  resources:
  mock_uss: mock_uss
  flight_planners: flight_planners
  combination_selector: combination_selector
  conflicting_flights: che_conflicting_flights
  invalid_flight_intents: che_invalid_flight_intents
  non_conflicting_flights: che_non_conflicting_flights
- priority_preemption_flights: che_conflicting_flights
  dss: scd_dss
  dss_instances: scd_dss_instances
  id_generator: id_generator

monitoring/uss_qualifier/suites/faa/uft/message_signing.yaml

@@ -8,7 +8,6 @@ resources:
  dss_crdb_cluster: resources.interuss.crdb.CockroachDBClusterResource?
  conflicting_flights: resources.flight_planning.FlightIntentsResource
  non_conflicting_flights: resources.flight_planning.FlightIntentsResource
- priority_preemption_flights: resources.flight_planning.FlightIntentsResource
  invalid_flight_intents: resources.flight_planning.FlightIntentsResource
  id_generator: resources.interuss.IDGeneratorResource
  utm_client_identity: resources.communications.ClientIdentityResource
@@ -27,7 +26,6 @@ actions:
  mock_uss: mock_uss
  conflicting_flights: conflicting_flights
  non_conflicting_flights: non_conflicting_flights
- priority_preemption_flights: priority_preemption_flights
  flight_planners: flight_planners
  nominal_planning_selector: combination_selector
  invalid_flight_intents: invalid_flight_intents