DB => Update code to new schema

...sAPI/src/helpers/Prisma/Extensions/UserResultExtension.ts

ExpressAPI/src/managers/GitlabManager.ts

ExpressAPI/src/managers/UserManager.ts

ExpressAPI/src/routes/AssignmentRoutes.ts

ExpressAPI/src/routes/ExerciseRoutes.ts

ExpressAPI/src/types/DatabaseTypes.ts