refactor(backend): withdraw mock of gql and replace with graphql-tag function

Created by: Elweyn

🍰 Pullrequest

Remove the gql function that has been mocked but replace them with the gql function of grqphql-tag.

Issues

• fixes #5152 (closed)

Todo

• Replace all import of gql of helper/jest gql
• Remove gql function of helper/jest