NetCore: MSDI refactor phase 2 (#9280)

* Moved adapters from Infra -> Core

* Allow Composition to accept a service collection instead of an IRegister

* Composition no longer takes IRegister as constructor arg

all tests passing

* Composition no longer implements IRegister

* Lose _uniques in Composition

* lose Composition OnCreatingFactory actions

* Clean up UmbracoCoreServiceCollectionExtensions & Composition

Less IFactory

* LightInject gone where TFW == netstandard2.0 || TFW == netcoreapp3.1

* Resolve dead code issues

* Rename IFactory methods to match IServiceProvider so they can be trivially swapped later.

* Rename IFactory methods to match IServiceProvider so they can be trivially swapped later (continued)

Thought the counts were low, it's mostly extension method usage

src/Umbraco.Tests.Integration/Testing/UmbracoIntegrationTest.cs

@@ -6,7 +6,6 @@ using Microsoft.Extensions.Hosting;
 using NUnit.Framework;
 using Umbraco.Core.Cache;
 using Umbraco.Core.Composing;
-using Umbraco.Core.Composing.LightInject;
 using Umbraco.Core.Configuration;
 using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
@@ -250,8 +249,7 @@ namespace Umbraco.Tests.Integration.Testing
                 AppCaches.NoCache, // Disable caches for integration tests
                 TestHelper.GetLoggingConfiguration(),
                 Configuration,
-                CreateTestRuntime,
-                out _);
+                CreateTestRuntime);
 
             services.AddSignalR();