Use ESC to cancel dragging in Zed (#30318)

Closes https://github.com/zed-industries/zed/issues/11887

ESC is always captured in terminal due to 


980bfae331/crates/terminal/src/terminal.rs (L1339-L1353)

so this part is not fixed.

Otherwise, all other drags are cancelled when ESC is pressed:


https://github.com/user-attachments/assets/6e70a1e5-c244-420b-9dec-ae2ac2997a59


Release Notes:

- Allowed to use ESC to cancel dragging in Zed

crates/project_panel/src/project_panel.rs

@@ -1346,6 +1346,10 @@ impl ProjectPanel {
     }
 
     fn cancel(&mut self, _: &menu::Cancel, window: &mut Window, cx: &mut Context<Self>) {
+        if cx.stop_active_drag(window) {
+            return;
+        }
+
         let previous_edit_state = self.edit_state.take();
         self.update_visible_entries(None, cx);
         self.marked_entries.clear();