Derive Reflect on Skybox (#17781)

# Objective

- Derive Reflect on Skybox component

## Solution

- Derive Reflect on Skybox component

crates/bevy_core_pipeline/src/skybox/mod.rs

@@ -3,12 +3,14 @@ use bevy_asset::{load_internal_asset, weak_handle, Handle};
 use bevy_ecs::{
     prelude::{Component, Entity},
     query::{QueryItem, With},
+    reflect::ReflectComponent,
     resource::Resource,
     schedule::IntoSystemConfigs,
     system::{Commands, Query, Res, ResMut},
 };
 use bevy_image::{BevyDefault, Image};
 use bevy_math::{Mat4, Quat};
+use bevy_reflect::{std_traits::ReflectDefault, Reflect};
 use bevy_render::{
     camera::Exposure,
     extract_component::{
@@ -46,7 +48,7 @@ impl Plugin for SkyboxPlugin {
             Shader::from_wgsl
         );
 
-        app.add_plugins((
+        app.register_type::<Skybox>().add_plugins((
             ExtractComponentPlugin::<Skybox>::default(),
             UniformComponentPlugin::<SkyboxUniforms>::default(),
         ));
@@ -87,7 +89,8 @@ impl Plugin for SkyboxPlugin {
 /// To do so, use `EnvironmentMapLight` alongside this component.
 ///
 /// See also <https://en.wikipedia.org/wiki/Skybox_(video_games)>.
-#[derive(Component, Clone)]
+#[derive(Component, Clone, Reflect)]
+#[reflect(Component, Default)]
 pub struct Skybox {
     pub image: Handle<Image>,
     /// Scale factor applied to the skybox image.