fix: Move login via email logic to local backend #47686
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Summary
Backends can decide which names they accept for login, e.g. with user_ldap you can configure arbitrary login fields. This was a hacky approach to allow login via email, so instead this is now only handled by the local user backend.
This also fixes some other related problems:
Other logic relys on
backend::get()
which was not handling email, so e.g. password policy could not block users logged in via email if they use out-dated passwords.Similar for other integrations, as the user backend was not consistent with what is a login name and what not.
Checklist