Removed PdfViewController, HtmlViewRenderer and FakeView to be replaced with ViewEngineResult Render method

Added HttpException class for missing HttpException for net8

Wrapped HttpContext.Session, GetJsonResult, IsAjaxRequest and GetUserIdentityName in controllers for net8

Added AuthenticationService to test Fab2ApprovalMKLink code for net8

Compile conditionally flags to debug in dotnet core

Fab2ApprovalSystem/DMO/AdminDMO.cs

@@ -130,13 +130,19 @@ public class AdminDMO {
     }
 
 #if !NET8
+
     public List<TrainingReportUser> GetTrainingReportUsers() {
         List<TrainingReportUser> CurrentReportUsers = (from a in FabApprovalDB.TrainingReportUsers select a).ToList();
         return CurrentReportUsers;
     }
-#else
+
+#endif
+
+#if NET8
+
     public List<TrainingReportUser> GetTrainingReportUsers() =>
         throw new NotImplementedException();
+
 #endif
 
 #if !NET8
@@ -179,14 +185,20 @@ public class AdminDMO {
         return;
     }
 
-#if !NET8
     public List<TrainingGroup> GetTrainingGroups() {
+#if !NET8
         var TrainingGroups = from a in FabApprovalDB.TrainingGroups select a;
         List<TrainingGroup> GroupsToReturn = TrainingGroups.ToList();
 
         return GroupsToReturn;
+#endif
+#if NET8
+    throw new NotImplementedException();
+#endif
     }
 
+#if !NET8
+
     public void AddNewTrainingGroup(string groupName) {
         TrainingGroup existing = null;
         // Check to see that the group name doesn't exist.