layout: Skip adding ScrollFrameHitTestItem to stacking context tree if the BoxFragment has inherited style pointer-events: none (#38884)

**fix some page cannot slide**
In the refactoring of https://github.com/servo/servo/pull/38480, a
segment of logic was missing.

11844ca5af/components/layout/display_list/mod.rs (L405-L410)
Testing: The page can be scrolled on the OpenHarmony device.
Fixes: https://github.com/servo/servo/pull/38480#issuecomment-3213734994

---------

Signed-off-by: kongbai1996 <1782765876@qq.com>
Signed-off-by: Fuguo <1782765876@qq.com>
Co-authored-by: Euclid Ye <yezhizhenjiakang@gmail.com>

components/layout/display_list/stacking_context.rs

@@ -1480,6 +1480,9 @@ impl BoxFragment {
             sensitivity,
         );
 
+        use style::computed_values::pointer_events::T as PointerEvents;
+
+        if self.style.get_inherited_ui().pointer_events != PointerEvents::None {
             stacking_context_tree
                 .hit_test_items
                 .push(ScrollFrameHitTestItem {
@@ -1488,6 +1491,7 @@ impl BoxFragment {
                     rect: scroll_frame_rect,
                     external_scroll_id,
                 });
+        }
 
         Some(OverflowFrameData {
             clip_id,