chore: Move component_preview into zed (#30480)

This improves our build times by ~0.2s

Closes #ISSUE

Release Notes:

- N/A

crates/zed/src/zed.rs

@@ -1,4 +1,5 @@
 mod app_menus;
+pub mod component_preview;
 pub mod inline_completion_registry;
 #[cfg(target_os = "macos")]
 pub(crate) mod mac_only_instance;