Move umbraco views to static assets and make that an RCL + Embedded language files (#12324)

* RCL for static assets to replace the nuspec

* Fix build

* Fix unit tests

* clean up in build.ps1

* Removed test (lang files will be removed later anyway)

* Fixed namespaces.. + Ensure we set web root path if missing (e.g. wwwroot folder do not exist) + Added StaticWebAssetBasePath

* fixed namespace

* cleanup

* Set root variable

* Added static assets

* Experimenting with StaticWebAssetBasePath

* Embedded lang files into Umbraco.Core

* Removed legacy test. New test can be implemented instead

* Fixed tests

* clean up

* Fix merge issue

src/Umbraco.Web.UI/Program.cs

@@ -14,6 +14,10 @@ namespace Umbraco.Cms.Web.UI
         public static IHostBuilder CreateHostBuilder(string[] args) =>
             Host.CreateDefaultBuilder(args)
                 .ConfigureUmbracoDefaults()
-                .ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup<Startup>());
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStaticWebAssets();
+                    webBuilder.UseStartup<Startup>();
+                });
     }
 }