ui: Remove old settings components (#15347)

This PR removes the old settings components, as they've been adapted
into other components for the settings UI.

Release Notes:

- N/A

crates/ui/src/components/stories.rs

@@ -10,7 +10,6 @@ mod label;
 mod list;
 mod list_header;
 mod list_item;
-mod setting;
 mod tab;
 mod tab_bar;
 mod toggle_button;
@@ -28,7 +27,6 @@ pub use label::*;
 pub use list::*;
 pub use list_header::*;
 pub use list_item::*;
-pub use setting::*;
 pub use tab::*;
 pub use tab_bar::*;
 pub use toggle_button::*;