Replace CADisplayLink with CVDisplayLink (#7583)

Release Notes:

- Fixed a bug that caused Zed to render at 60fps even on ProMotion
displays.
- Fixed a bug that could saturate the main thread event loop in certain
circumstances.

---------

Co-authored-by: Thorsten <thorsten@zed.dev>
Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Max <max@zed.dev>

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

@@ -186,18 +186,6 @@ impl Platform for TestPlatform {
         WindowAppearance::Light
     }
 
-    fn set_display_link_output_callback(
-        &self,
-        _display_id: DisplayId,
-        mut callback: Box<dyn FnMut() + Send>,
-    ) {
-        callback()
-    }
-
-    fn start_display_link(&self, _display_id: DisplayId) {}
-
-    fn stop_display_link(&self, _display_id: DisplayId) {}
-
     fn open_url(&self, url: &str) {
         *self.opened_url.borrow_mut() = Some(url.to_string())
     }