Use substitution token relation for refresh token

[ArthurZaharov]

Summary

A brief description of the pull request.

How it works

Screenshots/screencasts of the pull request introduced functionality.

Test plan

List of steps to manually test introduced functionality:

• Open GraphiQL App
• Make request using schema:

  query {
  me: {
    id
    name
  }
  }

• ...

Review notes

While reviewing pull-request (especially when it's your pull-request), please make sure that:

• you understand what problem is solved by PR and how is it solved
• new tests are in place, no redundant tests
• DB schema changes reflect new migrations
• newly introduced DB fields have indexes and constraints
• there are no missed files (migrations, view templates)
• required ENV variables added and described in .env.example and added to Heroku
• associated Heroku review app works correctly with introduced changes

Deploy notes

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References

• Resolves #174 Issue
• GitHub Pull Request ####