message: Improve logging in Highway testing.
diff: @@ -284,8 +284,8 @@ where
  None
  }
  DeliverySchedule::AtInstant(timestamp) => {
  + trace!("{:?} scheduled for {:?}", hwm, timestamp);
  let targeted = hwm.into_targeted(recipient);
  - trace!("{:?} scheduled for {:?}", targeted, timestamp);
  Some((targeted, timestamp))
  }
  })
  @@ -372,8 +372,11 @@ where
  .call_validator(&validator_id, |consensus| consensus.handle_timer(timestamp))?,
  NewVertex(v) => {
  - match self.add_vertex(validator_id, sender_id, v)? {
  - Ok(msgs) => msgs,
  + match self.add_vertex(validator_id, sender_id, v.clone())? {
  + Ok(msgs) => {
  + trace!("{:?} successfuly added to the state.", v);
  + msgs
  + }
  Err((v, error)) => {
  // TODO: Replace with tracing library and maybe add to sender state?
  error!("{:?} sent an invalid vertex {:?} to {:?} that resulted in {:?} error", sender_id, v, validator_id, error);
  @@ -424,7 +427,7 @@ where
  Ok(messages)
  }
  - // Adds vertex to the validator's state.
  + // Adds vertex to the `recipient` validator state.
  // Synchronizes its state if necessary.
  // From the POV of the test system, synchronization is immediate.
  #[allow(clippy::type_complexity)]
  