Replace auth endpoints with new graphql endpoint and mutations

[tetiana-kolmychek-devv]

We decided to move our only non-gql endpoints to gql as well and prepared structure for it on API already. (url if you want to test API in Altair: https://stage.devvapi.com/candidates/v1/auth/graphql)

Now we will replace them on the frontend. I will not remove old components and services right away, leaving them for around a month.
After implementation we plan to test it for a few days on the development version before propagating to the production.

[ivan-kolmychek-devv]

Deployed to https://devv.jobs.