refactor(task-drawer): enhance task deletion handling and update imports

- Updated task deletion logic to ensure consistency across task management slices, including clearing selections and updating the board state.
- Refactored imports to streamline task management functionality and improve code clarity.
- Added new Ant Design icon import for enhanced UI options.

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

@@ -101,6 +101,7 @@ export {
   DoubleRightOutlined,
   UserAddOutlined,
   ArrowsAltOutlined,
+  EllipsisOutlined
 } from '@ant-design/icons';
 
 // Re-export all components with React