Fix empty code actions menu trapping cursor (#33386)

Closes: https://github.com/zed-industries/zed/issues/33382
Follow-up to: https://github.com/zed-industries/zed/pull/32579

CC: @ConradIrwin @Anthony-Eid 

Release Notes:

- Fixed an issue with empty code actions menu locking the cursor
(Preview Only)

crates/editor/src/code_context_menus.rs

@@ -1205,7 +1205,7 @@ impl CodeActionContents {
         tasks_len + code_actions_len + self.debug_scenarios.len()
     }
 
-    fn is_empty(&self) -> bool {
+    pub fn is_empty(&self) -> bool {
         self.len() == 0
     }