feat(task-management): enhance task grouping and localization support

- Implemented unmapped task grouping for better organization of tasks without valid phases.
- Updated task distribution logic to handle unmapped tasks and added a corresponding group in the response.
- Enhanced localization by adding translations for "noTasksInGroup" in multiple languages.
- Improved task list components to support custom columns and better task management features.
- Refactored task management slice to include loading states for columns and custom columns.

worklenz-frontend/src/shared/antd-imports.ts

@@ -100,6 +100,7 @@ export {
   RetweetOutlined,
   DoubleRightOutlined,
   UserAddOutlined,
+  ArrowsAltOutlined,
 } from '@ant-design/icons';
 
 // Re-export all components with React