feat(task-management): enhance task details and subtask handling

- Added subtask-related properties to the Task interface for better management of subtasks.
- Implemented functionality to show and add subtasks directly within the task list, improving user interaction.
- Updated task rendering logic to accommodate new subtask features, enhancing overall task management experience.
- Removed unused components and optimized imports across various task management files for cleaner code.

worklenz-frontend/src/features/task-management/taskListFields.slice.ts

@@ -50,7 +50,6 @@ function saveFields(fields: TaskListField[]) {
 }
 
 const initialState: TaskListField[] = loadFields();
-console.log('TaskListFields slice initial state:', initialState);
 
 const taskListFieldsSlice = createSlice({
   name: 'taskManagementFields',