Wayland: double click (#9608)

This PR builds off of an earlier version of
https://github.com/zed-industries/zed/pull/9595, rearranges some of the
logic, and removes an unused platform API.

Release Notes:

- N/A

---------

Co-authored-by: apricotbucket28 <agustin.nicolas.marcos@outlook.com>

crates/gpui/src/app.rs

@@ -584,11 +584,6 @@ impl AppContext {
         self.platform.path_for_auxiliary_executable(name)
     }
 
-    /// Returns the maximum duration in which a second mouse click must occur for an event to be a double-click event.
-    pub fn double_click_interval(&self) -> Duration {
-        self.platform.double_click_interval()
-    }
-
     /// Displays a platform modal for selecting paths.
     /// When one or more paths are selected, they'll be relayed asynchronously via the returned oneshot channel.
     /// If cancelled, a `None` will be relayed instead.