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.Core/Extensions/PublishedContentExtensions.cs

@@ -1328,8 +1328,8 @@ namespace Umbraco.Extensions
                 {"NodeTypeAlias", "NodeTypeAlias"},
                 {"CreateDate", "CreateDate"},
                 {"UpdateDate", "UpdateDate"},
-                {"CreatorName", "CreatorName"},
-                {"WriterName", "WriterName"},
+                {"CreatorId", "CreatorId"},
+                {"WriterId", "WriterId"},
                 {"Url", "Url"}
             };