chore: remove deprecated flow from auth

[V-Gira]

Description

Screenshots/Screencast (for UI changes)

Checklist

• [ ] PR has been self reviewed by the author;
• [ ] Hard-to-understand areas of the code have been commented;
• [ ] If it is a core feature, unit tests have been added;

Important details for the reviewers

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• can be reviewed commit-by-commit
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