ui2: Get component stories compiling again (#3376)

This PR gets the component stories defined in `ui2` compiling again.

Release Notes:

- N/A

crates/ui2/src/components.rs

@@ -12,10 +12,12 @@ mod label;
 mod list;
 mod slot;
 mod stack;
-mod stories;
 mod toggle;
 mod tooltip;
 
+#[cfg(feature = "stories")]
+mod stories;
+
 pub use avatar::*;
 pub use button::*;
 pub use checkbox::*;
@@ -30,6 +32,8 @@ pub use label::*;
 pub use list::*;
 pub use slot::*;
 pub use stack::*;
-pub use stories::*;
 pub use toggle::*;
 pub use tooltip::*;
+
+#[cfg(feature = "stories")]
+pub use stories::*;