Remove ambient scope stack from httpcontext.items. (#12539)

This change makes it easier to use service calls in parallel whilst
a httpcontext is available.

tests/Umbraco.Tests.UnitTests/Umbraco.Infrastructure/Scoping/ScopeUnitTests.cs

@@ -71,13 +71,14 @@ namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Infrastructure.Scoping
             sqlContext.Setup(x => x.SqlSyntax).Returns(syntaxProviderMock.Object);
 
             return new ScopeProvider(
+                new AmbientScopeStack(),
+                new AmbientScopeContextStack(),
                 lockingMechanismFactory.Object,
                 databaseFactory.Object,
                 fileSystems,
                 new TestOptionsMonitor<CoreDebugSettings>(new CoreDebugSettings()),
                 mediaFileManager,
                 loggerFactory,
-                Mock.Of<IRequestCache>(),
                 Mock.Of<IEventAggregator>());
         }