[EC-247] Add columns to provider portal clients table (#2136)

* Added migration script to alter ProviderOrganizationOrganizationDetailsView to add new columns UserCount, Seats and Plan

* Modified EF query ProviderOrganizationOrganizationDetailsReadByProviderIdQuery

* Modified model to output new view columns

* Updated view to count only active users

* Filtering the organization user count by only confirmed users

src/Core/Models/Data/Provider/ProviderOrganizationOrganizationDetails.cs

@@ -10,5 +10,8 @@
         public string Settings { get; set; }
         public DateTime CreationDate { get; set; }
         public DateTime RevisionDate { get; set; }
+        public int UserCount { get; set; }
+        public int? Seats { get; set; }
+        public string Plan { get; set; }
     }
 }