layout: Use the PseudoElement from ServoThreadSafeLayoutNode in NodeAndStyleInfo (#38630)

Instead of storing the non-pseudo version of the node in
`NodeAndStyleInfo`, store the pseudo version and use that to query the
`PseudoElement` that a `NodeAndStyleInfo` refers to.

This is a step on the way toward fixing nested pseudo-elements in Servo.

Testing: This should not change behavior and is thus covered by existing
WPT tests.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/layout/construct_modern.rs

@@ -228,7 +228,7 @@ impl<'a, 'dom> ModernContainerBuilder<'a, 'dom> {
 
         let anonymous_info = LazyLock::new(|| {
             self.info
-                .pseudo(self.context, PseudoElement::ServoAnonymousBox)
+                .with_pseudo_element(self.context, PseudoElement::ServoAnonymousBox)
                 .expect("Should always be able to construct info for anonymous boxes.")
         });