[wasm] Work around System.Diagnostics.Tests.StopwatchTests.GetTimestamp failure (#62290)

Author: radical

src/libraries/System.Runtime.Extensions/tests/System/Diagnostics/Stopwatch.cs

@@ -15,7 +15,15 @@ public static class StopwatchTests
         public static void GetTimestamp()
         {
             long ts1 = Stopwatch.GetTimestamp();
-            Sleep();
+            if (PlatformDetection.IsBrowser)
+            {
+                // workaround for issue: https://github.com/dotnet/runtime/issues/62021
+                Sleep(5);
+            }
+            else
+            {
+                Sleep();
+            }
             long ts2 = Stopwatch.GetTimestamp();
             Assert.NotEqual(ts1, ts2);
         }