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

@@ -1480,14 +1480,18 @@ impl BoxFragment {
             sensitivity,
         );
 
-        stacking_context_tree
+        use style::computed_values::pointer_events::T as PointerEvents;
-            .hit_test_items
+
-            .push(ScrollFrameHitTestItem {
+        if self.style.get_inherited_ui().pointer_events != PointerEvents::None {
-                scroll_node_id: *parent_scroll_node_id,
+            stacking_context_tree
-                clip_id,
+                .hit_test_items
-                rect: scroll_frame_rect,
+                .push(ScrollFrameHitTestItem {
-                external_scroll_id,
+                    scroll_node_id: *parent_scroll_node_id,
-            });
+                    clip_id,
+                    rect: scroll_frame_rect,
+                    external_scroll_id,
+                });
+        }
 
         Some(OverflowFrameData {
             clip_id,