Introduce following for assistant panel (#14479)

Release Notes:

- Added support for following into the assistant panel.

---------

Co-authored-by: Max <max@zed.dev>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Nathan <nathan@zed.dev>

crates/editor/src/editor.rs

@@ -271,7 +271,7 @@ pub fn init(cx: &mut AppContext) {
     init_settings(cx);
 
     workspace::register_project_item::<Editor>(cx);
-    workspace::register_followable_item::<Editor>(cx);
+    workspace::FollowableViewRegistry::register::<Editor>(cx);
     workspace::register_deserializable_item::<Editor>(cx);
     cx.observe_new_views(
         |workspace: &mut Workspace, _cx: &mut ViewContext<Workspace>| {