feat(task-reporter): add reporter field to task data structure

- Introduced a new 'reporter' field in the task data structure for both backend and frontend task management.
- Updated the tasks-controller to include the reporter information when transforming task data.
- Modified the fetchTasks and fetchTasksV3 functions to handle the reporter field, ensuring it defaults to undefined when not present.

worklenz-backend/src/controllers/tasks-controller-v2.ts

@@ -1161,6 +1161,7 @@ export default class TasksControllerV2 extends TasksControllerBase {
         attachments_count: task.attachments_count || 0,
         has_dependencies: !!task.has_dependencies,
         schedule_id: task.schedule_id || null,
+        reporter: task.reporter || null,
       };
     });