Disabled problematic error in H/2

Author: ManickaP

src/libraries/System.Net.Http/tests/StressTests/HttpStress/ClientOperations.cs

@@ -482,6 +482,12 @@ public static (string name, Func<RequestContext, Task> operation)[] Operations =
 
         private static void ValidateStatusCode(HttpResponseMessage m, HttpStatusCode expectedStatus = HttpStatusCode.OK)
         {
+            // [ActiveIssue("https://github.com/dotnet/runtime/issues/55261")]
+            if (m.StatusCode == HttpStatusCode.InternalServerError)
+            {
+                throw new Exception("IGNORE");
+            }
+
             if (m.StatusCode != expectedStatus)
             {
                 throw new Exception($"Expected status code {expectedStatus}, got {m.StatusCode}");

src/libraries/System.Net.Http/tests/StressTests/HttpStress/StressClient.cs

@@ -209,6 +209,11 @@ async Task RunWorker(int taskNum)
                     {
                         _aggregator.RecordCancellation(opIndex, stopwatch.Elapsed);
                     }
+                    catch (Exception e) when (e.Message == "IGNORE")
+                    {
+                        // [ActiveIssue("https://github.com/dotnet/runtime/issues/55261")]
+                        // See ClientOperations.ValidateStatusCode
+                    }
                     catch (Exception e)
                     {
                         _aggregator.RecordFailure(e, opIndex, stopwatch.Elapsed, requestContext.IsCancellationRequested, taskNum: taskNum, iteration: i);