[IMP] mass_mailing_sms: Add mailing_type domain activity restriction

Restrict the displayed activities when clicking on "Email Marketing"
and "SMS Marketing" modules in the activity systray. Due to their
activities being linked to the same model, we need to distinguish which
activities belong to which module based on their assigned mailing_type
value. Without this domain restriction, users can still filter based on
mailing_type, but it is much less intuitive this way due to them being
separate apps.

Task: 2169498