Updates scopes in execution context to use a Stack so we know which is the top Scope/Context. Fixes disposing things on end request, fixes ensuring orphaned scopes are disposed at end request.

src/Umbraco.Infrastructure/Scoping/IHttpScopeReference.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Umbraco.
+// See LICENSE for more details.
+
+using System;
+
+namespace Umbraco.Cms.Core.Scoping
+{
+    /// <summary>
+    /// Cleans up orphaned <see cref="IScope"/> references at the end of a request
+    /// </summary>
+    public interface IHttpScopeReference : IDisposable
+    {
+        /// <summary>
+        /// Register for cleanup in the request
+        /// </summary>
+        void Register();
+    }
+}