We want to use real WooCommerce code instead of mocks for the tests that
are part of the woo test group and this change is necessary for a
subsequent commit that will modify
\MailPoet\Segments\WooCommerce::insertSubscriberFromOrder().
[MAILPOET-4570]
Remove the following errors:
(Method|Property|Function) has no (return )?type specified.
(Method|Function) has parameter with no type (specified).
[MAILPOET-3720]