Update backend refresh token logic

[dcoscolla-intermedia]

Closes #379

📑 Changes:

• Comment the logic to update the refresh token on backend/src/auth/services/auth.service.ts:349.
• Obtain current refresh token from refresh token strategy

✅ Checks

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [x] All the tests have passed

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