Updated the test case

Author: NanthiniMahalingam

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue29633.cs

@@ -1,3 +1,4 @@
+#if TEST_FAILS_ON_CATALYST // Highlighting Not Working Properly on Mac Catalyst, https://github.com/dotnet/maui/issues/27519
 using NUnit.Framework;
 using UITest.Appium;
 using UITest.Core;
@@ -20,4 +21,5 @@ public void PickerShouldShowSelectedItemHighlight()
 		App.Click("HighlightPickerItem");
 		VerifyScreenshot();
 	}
-}
+}
+#endif