Add notification on exploration

src/components/Challenge/ChallengeCardOnGoing.tsx

src/components/Challenge/challengeCardOnGoing.scss

src/components/Ecogesture/ecogestureCard.scss

src/components/Exploration/ExplorationFinished.tsx

src/components/Exploration/ExplorationView.tsx

src/enum/userChallenge.enum.ts

src/enum/userExploration.enum.ts

src/services/challenge.service.ts

src/services/exploration.service.ts