Moved more abstractions of models

src/Umbraco.Core/Models/PublishedContent/ThreadCultureVariationContextAccessor.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Concurrent;
-using System.Threading;
-
-namespace Umbraco.Core.Models.PublishedContent
-{
-    /// <summary>
-    /// Provides a CurrentUICulture-based implementation of <see cref="IVariationContextAccessor"/>.
-    /// </summary>
-    /// <remarks>
-    /// <para>This accessor does not support segments. There is no need to set the current context.</para>
-    /// </remarks>
-    public class ThreadCultureVariationContextAccessor : IVariationContextAccessor
-    {
-        private readonly ConcurrentDictionary<string, VariationContext> _contexts = new ConcurrentDictionary<string, VariationContext>();
-
-        public VariationContext VariationContext
-        {
-            get => _contexts.GetOrAdd(Thread.CurrentThread.CurrentUICulture.Name, culture => new VariationContext(culture));
-            set => throw new NotSupportedException();
-        }
-    }
-}