This commit deprecates the following Models\Newsletter methods:
- \MailPoet\Models\Newsletter::filterType()
- \MailPoet\Models\Newsletter::getWelcomeNotificationsForSegments()
- \MailPoet\Models\Newsletter::duplicate()
I'm doing this as part of a ticket to replace the models
NewsletterOption and NewsletterOptionField with Doctrine code. The
methods deprecated here use those models. But since they are not used
anymore in our codebase, I figured it would be easier to deprecate them
instead of replacing the models.
[MAILPOET-4150]
This commit removes the models Form, NewsletterLink and
StatisticsUnsubscribes as they were deprecated over six months ago and
are not used anymore in our codebase.
[MAILPOET-4325]
The test class \MailPoet\Subscribers\ImportExport\PersonalDataExporters\NewslettersExporterTest
calls the modified
\MailPoet\Models\StatisticsNewsletters::getAllForSubscriber() method
several times so it can be used to confirm that the changes made in this
commit work as expected.
[MAILPOET-4150]
