TD-4469 Removes unnecessary using statements from related classes

Author: kevwhitt-hee

DigitalLearningSolutions.Web.Tests/Services/ActivityServiceTests.cs

@@ -2,7 +2,6 @@
 {
     using System;
     using System.Collections.Generic;
-    using System.Configuration;
     using System.IO;
     using System.Linq;
     using ClosedXML.Excel;

DigitalLearningSolutions.Web/Controllers/TrackingSystem/Delegates/ActivityDelegatesController.cs

@@ -13,18 +13,15 @@
     using DigitalLearningSolutions.Web.Models.Enums;
     using DigitalLearningSolutions.Web.ServiceFilter;
     using DigitalLearningSolutions.Web.Services;
-    using DigitalLearningSolutions.Web.ViewModels.Supervisor;
     using DigitalLearningSolutions.Web.ViewModels.TrackingSystem.Delegates;
     using DigitalLearningSolutions.Web.ViewModels.TrackingSystem.Delegates.CourseDelegates;
     using Microsoft.AspNetCore.Authorization;
     using Microsoft.AspNetCore.Mvc;
     using Microsoft.Extensions.Configuration;
     using Microsoft.FeatureManagement.Mvc;
-    using Pipelines.Sockets.Unofficial;
     using System;
     using System.Collections.Generic;
     using System.Linq;
-    using System.Net;
 
     [FeatureGate(FeatureFlags.RefactoredTrackingSystem)]
     [Authorize(Policy = CustomPolicies.UserCentreAdmin)]

DigitalLearningSolutions.Web/Services/AdminDownloadFileService.cs

@@ -3,18 +3,14 @@
     using ClosedXML.Excel;
     using DigitalLearningSolutions.Data.DataServices.UserDataService;
     using DigitalLearningSolutions.Data.Helpers;
-    using DigitalLearningSolutions.Data.Models.Centres;
     using DigitalLearningSolutions.Data.Models.User;
-    using DocumentFormat.OpenXml.Spreadsheet;
     using Microsoft.Extensions.Configuration;
-    using StackExchange.Redis;
     using System;
     using System.Collections.Generic;
     using System.Data;
     using System.IO;
     using System.Linq;
-    using System.Threading.Tasks;
-    using ConfigurationExtensions = DigitalLearningSolutions.Data.Extensions.ConfigurationExtensions;
+    using ConfigurationExtensions = Data.Extensions.ConfigurationExtensions;
     public interface IAdminDownloadFileService
     {
         public byte[] GetAllAdminsFile(