Don't use the xunit return code when running in helix only (#39271)

Author: marcpopMSFT

src/Tests/Common/Program.cs

@@ -26,15 +26,25 @@ public static int Main(string[] args)
             BeforeTestRun(newArgs);
         }
 
-        int returnCode;
+        int returnCode = 0;
 
         if (testCommandLine.ShowSdkInfo)
         {
             returnCode = ShowSdkInfo();
         }
         else
         {
-            returnCode = Xunit.ConsoleClient.Program.Main(newArgs.ToArray());
+            var xunitReturnCode = Xunit.ConsoleClient.Program.Main(newArgs.ToArray());
+            if (Environment.GetEnvironmentVariable("HELIX_WORKITEM_PAYLOAD") != null)
+            {
+                // If we are running in Helix, we want the test work item to return 0 unless there's a crash
+                Console.WriteLine($"Xunit return code: {xunitReturnCode}");
+            }
+            else
+            {
+                // If we are running locally, we to return the xunit return code
+                returnCode = xunitReturnCode;
+            }
         }
 
         if (testCommandLine.ShouldShowHelp)