Use the email_normalized from mail.address.mixin if available to get always
a normalized email address in the unsubscribe link. That allows to simplify
the search on email address in the controllers -> Check blacklist,
send feedback, etc..
Task ID 1896677
Apply the mail.address.mixin on blacklist mixin. So that every model
inheriting the blacklist.mixin will also inherit the address.mixin.
That simplify also the comparaison to - and the searches on - the
blacklist.
Task ID 1896677
Purpose is to have some basis performance counters when sending a mailing
on 100 records, with and without blacklist involved. It will serves as
reference when working on mass mailing performance improvements in future
tasks.
This commit is linked to task ID 1889703 and PR #27526.