Use better fallback for empty rerun action (#32031)

Kirill Bulatov created 

When invoking the task rerun action before any task had been run, it
falls back to task selection modal.
Adjust this fall back to use the debugger view, if available:

Before:

![before](https://github.com/user-attachments/assets/737d2dc1-15a4-4eea-a5f9-4aff6c7600cc)


After:

![after](https://github.com/user-attachments/assets/43381b85-5167-44e7-a8b0-865a64eaa6ea)


Release Notes:

- N/A

Change summary

crates/tasks_ui/src/tasks_ui.rs | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

Detailed changes

crates/tasks_ui/src/tasks_ui.rs 🔗 

@@ -80,7 +80,14 @@ pub fn init(cx: &mut App) {
                             );
                         }
                     } else {
-                        toggle_modal(workspace, None, window, cx).detach();
+                        spawn_task_or_modal(
+                            workspace,
+                            &Spawn::ViaModal {
+                                reveal_target: None,
+                            },
+                            window,
+                            cx,
+                        );
                     };
                 });
         },