Make UniformList non-occluding. (#9806)

Fixes https://github.com/zed-industries/zed/issues/9723

Move the `occlude` in the places where they are needed.

Release Notes:

- Fixed right click in the project panel's empty region
([9723](https://github.com/zed-industries/zed/issues/9723))

Co-authored-by: Antonio Scandurra <antonio@zed.dev>

crates/gpui/src/elements/uniform_list.rs

@@ -48,7 +48,6 @@ where
         interactivity: Interactivity {
             element_id: Some(id),
             base_style: Box::new(base_style),
-            occlude_mouse: true,
 
             #[cfg(debug_assertions)]
             location: Some(*core::panic::Location::caller()),