Allow contrib to disable default integration of a profile type into user account UI

Follow-up to: #1668292: Move simplified Profile2 module into core

Problem

• Contributed modules/appliances may want/need to output/manage certain profile types on their own, omitting the default output and integration into the user account UI. (e.g., Commerce)

Proposed solution

1. Add a property/flag to ProfileType that indicates whether Profile module's default UI and user account integration should be enabled.