updateRaceStatus method Null safety
Updates the race statuses
Implementation
void updateRaceStatus() {
  final raceStarted = countdown.isCompleted;
  final raceNotEnded =
      countdown.milestoneNotCompletedFor(RaceDayEvents.raceEnd);
  canStartRace.value = raceStarted && raceNotEnded;
  isRaceDay.value = countdown.milestoneCompletedFor(RaceDayEvents.raceDay);
}