[FIX] mail : remove blacklist from mail.channel.partner

Blacklist was added to mail.channel.partner in order to avoid sending
mail notification for a channel in send mail mode if the partner was
blacklisted.

But as everythin is done using directly the res partner model, this
inheritance is completelly useless.

Moreover, since introduction of mail.address.mixin with email_normalization
(inherited by blacklist.mixin), the partner_email cannot be normalized as it
is a non stored related field. The computation of email_normalized will
fail.

Task ID : 1911716
Closes PR #28922

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