Change mission to exploration + finished test

src/components/Challenge/ChallengeCardOnGoing.tsx

src/components/Challenge/StarsContainer.tsx

...nents/Challenge/__snapshots__/ChallengeCard.spec.tsx.snap

...s/Challenge/__snapshots__/ChallengeCardDone.spec.tsx.snap

...nents/Challenge/__snapshots__/ChallengeView.spec.tsx.snap

src/db/explorationEntity.json

src/doctypes/com-grandlyon-ecolyo-exploration.ts

src/doctypes/com-grandlyon-ecolyo-mission.ts

src/doctypes/index.ts

src/enum/userChallenge.enum.ts

src/enum/userExploration.enum.ts

src/locales/fr.json

src/models/challenge.model.ts

src/models/exploration.model.ts

src/models/index.ts

src/services/challenge.service.spec.ts

src/services/challenge.service.ts

src/services/exploration.service.spec.ts

src/services/exploration.service.ts

src/services/mission.service.spec.ts