public virtual OnNavigationRemovedNode VisitOnNavigationRemoved(OnNavigationRemovedNode node) => node;
 public override OnNavigationRemovedNode VisitOnNavigationRemoved(OnNavigationRemovedNode node)
 {
     Dispatcher._immediateConventionScope.OnNavigationRemoved(
         node.SourceEntityTypeBuilder, node.TargetEntityTypeBuilder, node.NavigationName, node.MemberInfo);
     return(null);
 }