Reintroduce ProMotion support (#7347)

This re-introduces the changes of #7305 but this time we create a
display link using the `NSScreen` associated with the window. We're
hoping we'll get these frame requests more reliably, and this seems
supported by the fact that awakening my laptop restores the frame
requests.

Release Notes:

- See #7305.

Co-authored-by: Nathan <nathan@zed.dev>

crates/gpui/src/platform/test/window.rs

@@ -282,8 +282,6 @@ impl PlatformWindow for TestWindow {
         unimplemented!()
     }
 
-    fn invalidate(&self) {}
-
     fn draw(&self, _scene: &crate::Scene) {}
 
     fn sprite_atlas(&self) -> sync::Arc<dyn crate::PlatformAtlas> {