Migrating tests that depend on Published Cache from the old test project (#11242)

* starts cleaning up old test project, removing ones we'll never convert, moves new test to where it should be.

* Makes ContentNodeKit immutable properties, moves first nucache tests over

* Gets the Nucache unit tests working and refactors a bit to use builder pattern for models.

* Migrates first xml based cache test to use nucache.

* Migrates a bunch more

* Migrates remaining tests for PublishedContentTests

* Moves PublishedRouterTests

* Moves PublishedContentExtensionTests

* Moves more tests.

* committing wip

* committing wip

* Gets PublishedContentLanguageVariantTests converted and working.

* Fixes DataTable ext method and moves PublishedContentDataTableTests

* Moves PublishedMediaTests

* wip - moving EntityXmlSerializerTests

* Moves more tests

* moves more tests

* moves more tests

* Move another test

* Moves more tests

* Fix test

* move another test

* Moves more tests

* Moves more tests

* Moves more tests

* wip before merge

* More tests

* More tests

* More tests

* More tests

* More tests

* More tests

* Cleanup and moving classes.

* Remove unused code

* Fixed failing tests, due to new null checks, that did not exist in v8

* Avoid breaking changes

* Unbreak more things, even that it the old solution was crazy..

* Fixed bug where ordering of stream readings was changed..

* cleanup

Co-authored-by: Bjarke Berg <mail@bergmania.dk>

src/Umbraco.PublishedCache.NuCache/DomainCacheExtensions.cs

@@ -0,0 +1,15 @@
+using System.Linq;
+using Umbraco.Cms.Core.PublishedCache;
+
+namespace Umbraco.Cms.Infrastructure.PublishedCache
+{
+    public static class DomainCacheExtensions
+    {
+        public static bool GetAssignedWithCulture(this IDomainCache domainCache, string culture, int documentId, bool includeWildcards = false)
+        {
+            var assigned = domainCache.GetAssigned(documentId, includeWildcards);
+
+            return culture is null ? assigned.Any() : assigned.Any(x => x.Culture == culture);
+        }
+    }
+}