fix: Move login via email logic to local backendfix/move-email-logic-local-user-backend

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.

Co-authored-by: Ferdinand Thiessen <opensource@fthiessen.de>
Co-authored-by: Côme Chilliet <91878298+come-nc@users.noreply.github.com>
Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

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