chore: remove unnecessary async

...s/Challenge/ChallengeCardOnGoing/ChallengeCardOnGoing.tsx

src/components/Duel/DuelOngoing/DuelOngoing.spec.tsx

src/components/Duel/DuelOngoing/DuelOngoing.tsx

src/components/Quiz/QuizQuestion/QuizQuestionContent.tsx

...omponents/Quiz/QuizQuestion/QuizQuestionContentCustom.tsx

src/components/Splash/SplashRoot.tsx

src/services/challenge.service.spec.ts

src/services/challenge.service.ts

src/services/duel.service.spec.ts

src/services/duel.service.ts

src/services/exploration.service.spec.ts

src/services/exploration.service.ts

src/services/initialization.service.spec.ts

src/services/initialization.service.ts

src/services/quiz.service.spec.ts

src/services/quiz.service.ts