Fix registering all reflection types that are components as reflection components (#16800)

# Objective

Fixes #16659

## Solution

- I just added all the `#[reflect(Component)]` attributes where
necessary.

## Testing

I wrote a small program that scans the bevy code for all structs and
enums that derive `Component` and `Reflect`, but don't have the
attribute `#[reflect(Component)]`.

I don't know if this testing program should be part of the testing suite
of bevy. It takes a bit of time to scan the whole codebase. In any case,
I've published it [here](https://github.com/anlumo/bevy-reflect-check).

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>

crates/bevy_gizmos/src/retained.rs

@@ -3,7 +3,10 @@
 use core::ops::{Deref, DerefMut};
 
 use bevy_asset::Handle;
-use bevy_ecs::component::{require, Component};
+use bevy_ecs::{
+    component::{require, Component},
+    reflect::ReflectComponent,
+};
 use bevy_reflect::Reflect;
 use bevy_transform::components::Transform;
 
@@ -73,6 +76,7 @@ impl DerefMut for GizmoAsset {
 ///
 /// [`Gizmos`]: crate::gizmos::Gizmos
 #[derive(Component, Clone, Debug, Default, Reflect)]
+#[reflect(Component)]
 #[require(Transform)]
 pub struct Gizmo {
     /// The handle to the gizmo to draw.

crates/bevy_input/src/gamepad.rs

@@ -2,6 +2,8 @@
 
 use crate::{Axis, ButtonInput, ButtonState};
 use bevy_core::Name;
+#[cfg(feature = "bevy_reflect")]
+use bevy_ecs::prelude::ReflectComponent;
 use bevy_ecs::{
     change_detection::DetectChangesMut,
     component::Component,
@@ -331,7 +333,7 @@ pub enum ButtonSettingsError {
 /// }
 /// ```
 #[derive(Component, Debug)]
-#[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug))]
+#[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug, Component))]
 #[require(GamepadSettings)]
 pub struct Gamepad {
     /// The USB vendor ID as assigned by the USB-IF, if available.
@@ -688,7 +690,11 @@ pub enum GamepadInput {
 /// should register. Events that don't meet the change thresholds defined in [`GamepadSettings`]
 /// will not register. To modify these settings, mutate the corresponding component.
 #[derive(Component, Clone, Default, Debug)]
-#[cfg_attr(feature = "bevy_reflect", derive(Reflect), reflect(Debug, Default))]
+#[cfg_attr(
+    feature = "bevy_reflect",
+    derive(Reflect),
+    reflect(Debug, Default, Component)
+)]
 pub struct GamepadSettings {
     /// The default button settings.
     pub default_button_settings: ButtonSettings,

crates/bevy_render/src/sync_world.rs

@@ -166,6 +166,7 @@ pub type MainEntityHashSet = hashbrown::HashSet<MainEntity, EntityHash>;
 
 /// Marker component that indicates that its entity needs to be despawned at the end of the frame.
 #[derive(Component, Copy, Clone, Debug, Default, Reflect)]
+#[reflect(Component)]
 pub struct TemporaryRenderEntity;
 
 /// A record enum to what entities with [`SyncToRenderWorld`] have been added or removed.

crates/bevy_ui/src/ui_node.rs

@@ -2663,6 +2663,7 @@ impl<'w, 's> DefaultUiCamera<'w, 's> {
 /// }
 /// ```
 #[derive(Component, Clone, Copy, Default, Debug, Reflect, Eq, PartialEq)]
+#[reflect(Component)]
 pub enum UiAntiAlias {
     /// UI will render with anti-aliasing
     #[default]
@@ -2688,6 +2689,7 @@ pub enum UiAntiAlias {
 /// }
 /// ```
 #[derive(Component, Clone, Copy, Debug, Reflect, Eq, PartialEq)]
+#[reflect(Component)]
 pub struct BoxShadowSamples(pub u32);
 
 impl Default for BoxShadowSamples {