In Dns.RunAsync calls AfterResolution when canceled (dotnet#104435)

* Calling AfterResolution when canceled
* Mark log entry with OperationCanceledException

src/libraries/System.Net.NameResolution/src/System/Net/Dns.cs

@@ -694,6 +694,8 @@ private static Task<TResult> RunAsync<TResult>(Func<object, long, TResult> func,
                         lock (s_tasks)
                         {
                             ((ICollection<KeyValuePair<object, Task>>)s_tasks).Remove(new KeyValuePair<object, Task>(key!, task));
+                            // Since it was canceled, func(..) had not executed and call AfterResolution it needs to be called here.
+                            NameResolutionTelemetry.Log.AfterResolution(key!, startingTimestamp, new OperationCanceledException());
                         }
                     }, key, CancellationToken.None, TaskContinuationOptions.OnlyOnCanceled | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
                 }