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

Fab2ApprovalMKLink/Services/DbConnectionService.cs

@@ -0,0 +1,22 @@
+using System.Data;
+
+using Fab2ApprovalSystem.Models;
+
+using Microsoft.Data.SqlClient;
+
+namespace Fab2ApprovalSystem.Services;
+
+public interface IDbConnectionService {
+    IDbConnection GetConnection();
+}
+
+public class DbConnectionService : IDbConnectionService {
+    private readonly string _dbConnectionString;
+
+    public DbConnectionService(AppSettings appSettings) {
+        _dbConnectionString = appSettings.DBConnectionString;
+    }
+
+    public IDbConnection GetConnection() =>
+        new SqlConnection(_dbConnectionString);
+}