Add some missing reflect for volumetric fog types (#13592)

# Objective

- While experimenting with it I realized it's not reflectable

## Solution

- Add missing Reflect derive

crates/bevy_pbr/src/volumetric_fog/mod.rs

@@ -45,11 +45,13 @@ use bevy_ecs::{
     component::Component,
     entity::Entity,
     query::{Has, QueryItem, With},
+    reflect::ReflectComponent,
     schedule::IntoSystemConfigs as _,
     system::{lifetimeless::Read, Commands, Query, Res, ResMut, Resource},
     world::{FromWorld, World},
 };
 use bevy_math::Vec3;
+use bevy_reflect::Reflect;
 use bevy_render::{
     render_graph::{NodeRunError, RenderGraphApp, RenderGraphContext, ViewNode, ViewNodeRunner},
     render_resource::{
@@ -86,12 +88,14 @@ pub struct VolumetricFogPlugin;
 /// (`shadows_enabled: true`) to make volumetric fog interact with it.
 ///
 /// This allows the light to generate light shafts/god rays.
-#[derive(Clone, Copy, Component, Default, Debug)]
+#[derive(Clone, Copy, Component, Default, Debug, Reflect)]
+#[reflect(Component)]
 pub struct VolumetricLight;
 
 /// When placed on a [`Camera3d`], enables volumetric fog and volumetric
 /// lighting, also known as light shafts or god rays.
-#[derive(Clone, Copy, Component, Debug)]
+#[derive(Clone, Copy, Component, Debug, Reflect)]
+#[reflect(Component)]
 pub struct VolumetricFogSettings {
     /// The color of the fog.
     ///
@@ -246,6 +250,8 @@ impl Plugin for VolumetricFogPlugin {
             "volumetric_fog.wgsl",
             Shader::from_wgsl
         );
+        app.register_type::<VolumetricFogSettings>()
+            .register_type::<VolumetricLight>();
 
         let Some(render_app) = app.get_sub_app_mut(RenderApp) else {
             return;