connect userListPage with backend API

[kaczor6418]

• [ ] Users should be loaded from the backend. Remember to use pagination, we would rather not load all the users at once
• [ ] Sorting is handled by the backend, so please remove the logic responsible for sorting and replace it with a call to backend
• [ ] Paging is handled by the backend, so please remove the logic responsible for changing pages and replace it with calls to the backend
• [ ] User interfaces should be generated by openapi from api schema