Move out of the class that is disabled from MT tests.

Author: ilonatommy

src/libraries/System.Runtime.InteropServices.JavaScript/tests/System.Runtime.InteropServices.JavaScript.UnitTests/System/Runtime/InteropServices/JavaScript/JSExportTest.cs

@@ -48,6 +48,13 @@ public async Task JsExportInt32DiscardNoWait(int value)
             res = await invoke(value, echoName);
             Assert.Equal<T>(value, res);
         }
+
+        [Fact]
+        public async void JSExportCompletedTaskReturnsResolvedPromise()
+        {
+            string result = await JavaScriptTestHelper.InvokeReturnCompletedTask();
+            Assert.Equal("resolved", result);
+        }
     }
 
     [ConditionalClass(typeof(PlatformDetection), nameof(PlatformDetection.IsNotWasmThreadingSupported))]
@@ -436,12 +443,5 @@ public async Task InternalsVisibleToDoesntBreak()
         {
             Assert.Equal(JavaScriptLibrary.JavaScriptInterop.ValidationMethod(5, 6), await JavaScriptTestHelper.callJavaScriptLibrary(5, 6));
         }
-
-        [Fact]
-        public async void JSExportCompletedTaskReturnsResolvedPromise()
-        {
-            string result = await JavaScriptTestHelper.InvokeReturnCompletedTask();
-            Assert.Equal("resolved", result);
-        }
     }
 }