Removed unused and unnecessary Configuration property

The `Configuration` property dictionary previously mapped to the `AttributeDescriptor.Configuration` property, which was removed as part of the 4.0.0 migration to `AttributeTypeDescriptor` based configuration. As such, it no longer provides a reliable test for evaluating compatible type property mapping. That said, we are effectively testing that with `VersionHistory` and `ModelType`, so it's not strictly necessary, either.

Author: JeremyCaney

OnTopic.Tests/ViewModels/CompatiblePropertyTopicViewModel.cs

@@ -26,9 +26,6 @@ public class CompatiblePropertyTopicViewModel {
 
     public ModelType ModelType { get; set; }
 
-    [DisallowNull]
-    public IDictionary<string, string?>? Configuration { get; set; }
-
     public List<DateTime>? VersionHistory { get; set; }
 
   } //Class