feat(task-management): enhance task date handling and UI components in TaskListV2

- Added startDate and dueDate fields to task data structure for improved date management.
- Updated TaskRow to include date pickers for start and due dates with clear functionality.
- Enhanced LabelsSelector to support dynamic label rendering and improved visual feedback.
- Refactored AssigneeSelector and CustomColordLabel components for better integration with task data.
- Improved dropdown positioning logic in LabelsSelector for better user experience.
- Added translations for new date-related UI elements in multiple languages.

worklenz-frontend/public/locales/de/task-list-table.json

@@ -59,5 +59,11 @@
     "convertToTask": "In Aufgabe umwandeln",
     "delete": "Löschen",
     "searchByNameInputPlaceholder": "Nach Namen suchen"
-  }
+  },
+  "setDueDate": "Fälligkeitsdatum festlegen",
+  "setStartDate": "Startdatum festlegen",
+  "clearDueDate": "Fälligkeitsdatum löschen",
+  "clearStartDate": "Startdatum löschen",
+  "dueDatePlaceholder": "Fälligkeitsdatum",
+  "startDatePlaceholder": "Startdatum"
 }