[Trunk | Library]: subscribe.service.ts: Connect redesign: Add field 'isSubscribedSubject: BehaviorSubject<boolean>' and methods to initiate and get it (singleton service, to update subscriber status).
[Trunk | Library]: subscribe.service.ts: Connect redesign: Add field 'isSubscribedSubject: BehaviorSubject<boolean>' and methods to initiate and get it (singleton service, to update subscriber status).