Auto merge of #26953 - mrobinson:cancel-reparent, r=nox

Cancel animations for nodes which are removed from the DOM

This includes nodes which are being reparented.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

components/script/dom/document.rs

@@ -3861,6 +3861,10 @@ impl Document {
             .borrow()
             .do_post_reflow_update(&self.window, self.current_animation_timeline_value());
     }
+
+    pub(crate) fn cancel_animations_for_node(&self, node: &Node) {
+        self.animations.borrow().cancel_animations_for_node(node);
+    }
 }
 
 impl Element {