Allauth supports multiple email addresses per user. While this is
not intended in allgo, it is still possible to configure multiple
addresses using the /accounts/email/ endpoint.

Problem: even with ACCOUNT_EMAIL_VERIFICATION="mandatory", allauth
does not ensure that all addresses are verified. It only ensure
that *any* address is verified.

--> even if the user is validted by all auth, we still need to ensure
that the relevant address is verified before granting access