Fix all Picker Item cursor to use Pointer. (#8877)

Before:

https://github.com/zed-industries/zed/assets/5518/84874858-7847-4fa4-b7a3-41ecc65a2f7d

After: 

https://github.com/zed-industries/zed/assets/5518/d395ea96-aa26-4de1-8bfc-73cc43ee75cf


Release Notes:

- Made picker items to use `Pointer` cursor style

crates/picker/src/picker.rs

@@ -325,6 +325,7 @@ impl<D: PickerDelegate> Picker<D> {
     fn render_element(&self, cx: &mut ViewContext<Self>, ix: usize) -> impl IntoElement {
         div()
             .id(("item", ix))
+            .cursor_pointer()
             .on_click(cx.listener(move |this, event: &ClickEvent, cx| {
                 this.handle_click(ix, event.down.modifiers.command, cx)
             }))