NetCore: MSDI refactor remove IFactory & IRegister (#9308)

* Replace IFactory with IServiceProvider

* Replace IRegister with IServiceCollection

* Fix Rte.cshtml so the view can service locate.

* Replace Composing Lifetime with MSDI ServiceLifetime

* Remove ServiceProvider AddMultipleUnique extension

* Remove Umbraco.Web.Composing.Current.Reset and any calls

* Remove LightInject from net framework projects

* Brought back a helper for setting MediaFileSystem underlying IFileSystem

src/Umbraco.Tests/PublishedContent/PublishedContentLanguageVariantTests.cs

@@ -4,6 +4,7 @@ using System.Collections.ObjectModel;
 using System.Linq;
 using Moq;
 using NUnit.Framework;
+using Umbraco.Core;
 using Umbraco.Core.Configuration.Models;
 using Umbraco.Core.Models;
 using Umbraco.Core.Models.PublishedContent;
@@ -23,7 +24,7 @@ namespace Umbraco.Tests.PublishedContent
         {
             base.Compose();
 
-            Composition.RegisterUnique(_ => GetServiceContext());
+            Composition.Services.AddUnique(_ => GetServiceContext());
         }
 
         protected ServiceContext GetServiceContext()