Change how a task stress test is disabled (#80981)

Author: stephentoub

src/libraries/System.Threading.Tasks/tests/Task/TaskContinueWithTests.cs

@@ -41,8 +41,8 @@ public static void RunContinueWithAsyncStateCheckTests()
 
         // Stresses on multiple continuations from a single antecedent
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
-        [SkipOnCoreClr("Test timing out: https://github.com/dotnet/runtime/issues/2271", ~RuntimeConfiguration.Release)]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/2271")]
+        [SkipOnCoreClr("Stress test", ~RuntimeConfiguration.Release)]
+        [SkipOnMono("Stress test")]
         public static void RunContinueWithStressTestsNoState()
         {
             int numIterations = 3;