and update it when users have to use their email to interact with
Notify service.
Initial population:
If user has email_auth, set last_validated_at to logged_in_at.
If user has sms_auth, set it to created_at.
Then:
Update email_access_valdiated_at date when:
- user with email_auth logs in
- new user is created
- user resets password when logged out, meaning we send them an
email with a link they have to click to reset their password.
