Connection to telegram doesn't work

### Description of the issue

Telegram API restricts connection to the account via phone number.

### Possible solutions

You need to redo it to connection via tg username instead

_{Huly®: UBERF-9045}

No file, test, or entry point is named in the issue. Start by locating the Telegram connection flow and verify how account authentication currently uses a phone number. Done means the Telegram integration can connect through a username instead, with coverage for the affected flow; the issue has no specified test location.

Written by the indexing model from the issue text.