debugger: Fix global debug tasks not being picked up (#33664)

Release Notes:

- Fixed a bug which caused global debug scenarios (from global
.zed/debug.json) to not be picked up.

crates/project/src/project.rs

@@ -2975,6 +2975,20 @@ impl Project {
                 }),
                 Err(_) => {}
             },
+            SettingsObserverEvent::LocalDebugScenariosUpdated(result) => match result {
+                Err(InvalidSettingsError::Debug { message, path }) => {
+                    let message =
+                        format!("Failed to set local debug scenarios in {path:?}:\n{message}");
+                    cx.emit(Event::Toast {
+                        notification_id: format!("local-debug-scenarios-{path:?}").into(),
+                        message,
+                    });
+                }
+                Ok(path) => cx.emit(Event::HideToast {
+                    notification_id: format!("local-debug-scenarios-{path:?}").into(),
+                }),
+                Err(_) => {}
+            },
         }
     }