Avoid panicking with non-UI nodes (#12213)

# Objective

- Fixes https://github.com/bevyengine/bevy/issues/10826
- Fixes https://github.com/bevyengine/bevy/issues/9615

## Solution

- Early-out when components are missing.

crates/bevy_ui/src/layout/mod.rs

@@ -411,7 +411,9 @@ pub fn ui_layout_system(
         mut absolute_location: Vec2,
     ) {
         if let Ok((mut node, mut transform)) = node_transform_query.get_mut(entity) {
-            let layout = ui_surface.get_layout(entity).unwrap();
+            let Ok(layout) = ui_surface.get_layout(entity) else {
+                return;
+            };
             let layout_size =
                 inverse_target_scale_factor * Vec2::new(layout.size.width, layout.size.height);
             let layout_location =

crates/bevy_ui/src/update.rs

@@ -155,7 +155,9 @@ fn update_children_target_camera(
 
     for &child in children {
         // Skip if the child has already been updated or update is not needed
-        if updated_entities.contains(&child) || camera_to_set == node_query.get(child).unwrap() {
+        if updated_entities.contains(&child)
+            || camera_to_set == node_query.get(child).ok().flatten()
+        {
             continue;
         }