Fix misleading "Login" field label in Keystore to "Username" (#3394)

* Initial plan

* Change login_password field label from 'Login' to 'Username'

Co-authored-by: fiftin <[email protected]>

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Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: fiftin <[email protected]>
Co-authored-by: Denis Gukov <[email protected]>

Author: Copilot