debugger: Improve debugger panel empty state (#32889)

Before:

![CleanShot 2025-06-17 at 13 48
58@2x](https://github.com/user-attachments/assets/16ecebfa-871e-4a2d-b6a3-2178de70aaef)

After:

![CleanShot 2025-06-17 at 13 49
24@2x](https://github.com/user-attachments/assets/2d8a0444-6088-45f1-a880-0bdd0aef968e)


Release Notes:

- N/A (Beta: Improved the debugger panel when there are no currently
active sessions)

crates/zed/src/zed.rs

@@ -86,7 +86,6 @@ actions!(
         OpenDefaultSettings,
         OpenProjectSettings,
         OpenProjectTasks,
-        OpenProjectDebugTasks,
         OpenTasks,
         OpenDebugTasks,
         ResetDatabase,
@@ -1512,7 +1511,7 @@ fn open_project_tasks_file(
 
 fn open_project_debug_tasks_file(
     workspace: &mut Workspace,
-    _: &OpenProjectDebugTasks,
+    _: &zed_actions::OpenProjectDebugTasks,
     window: &mut Window,
     cx: &mut Context<Workspace>,
 ) {

crates/zed/src/zed/app_menus.rs

@@ -215,7 +215,7 @@ pub fn app_menus() -> Vec<Menu> {
                 MenuItem::action("Start Debugger", debugger_ui::Start),
                 MenuItem::separator(),
                 MenuItem::action("Edit tasks.json...", crate::zed::OpenProjectTasks),
-                MenuItem::action("Edit debug.json...", crate::zed::OpenProjectDebugTasks),
+                MenuItem::action("Edit debug.json...", zed_actions::OpenProjectDebugTasks),
                 MenuItem::separator(),
                 MenuItem::action("Continue", debugger_ui::Continue),
                 MenuItem::action("Step Over", debugger_ui::StepOver),