feat(splash): Displays progess bar and better error managment

src/assets/png/logos_partenaires.svg

src/components/Splash/SplashRoot.spec.tsx

src/components/Splash/SplashRoot.tsx

src/components/Splash/SplashScreen.spec.tsx

src/components/Splash/SplashScreen.tsx

src/components/Splash/SplashScreenError.spec.tsx

src/components/Splash/SplashScreenError.tsx

src/components/Splash/__snapshots__/SplashRoot.spec.tsx.snap

...omponents/Splash/__snapshots__/SplashScreen.spec.tsx.snap

...ents/Splash/__snapshots__/SplashScreenError.spec.tsx.snap

src/components/Splash/splashScreen.scss

src/locales/fr.json

src/migrations/migration.service.ts

src/models/initialisationSteps.model.ts

src/services/initialization.service.spec.ts

src/services/initialization.service.ts

src/services/partnersInfo.service.ts