Merge Component and ComponentPreview trait (#28365)

- Merge `Component` and `ComponentPreview` trait
- Adds a number of component previews
- Removes a number of stories

Release Notes:

- N/A

crates/ui/src/components/stories.rs

@@ -1,6 +1,4 @@
 mod context_menu;
-mod disclosure;
-mod icon;
 mod icon_button;
 mod keybinding;
 mod list;
@@ -11,8 +9,6 @@ mod tab_bar;
 mod toggle_button;
 
 pub use context_menu::*;
-pub use disclosure::*;
-pub use icon::*;
 pub use icon_button::*;
 pub use keybinding::*;
 pub use list::*;