code: def _user_workspace_names(self, user: dict) -> List[str]:
      workspace_names = [
          workspace_name
          for workspace_name in user.get("workspaces", [])
      ]
  
      if user["username"] in workspace_names:
          return workspace_names
  
      return [user["username"]] + workspace_names
  
file_path: argilla/src/argilla/server/cli/database/users/migrate.py
imports: import asyncio
  from typing import TYPE_CHECKING, List, Optional
  import typer
  import yaml
  from argilla.pydantic_v1 import BaseModel, Field, constr
  from argilla.server.database import AsyncSessionLocal
  from argilla.server.models import User, UserRole
  from argilla.server.security.auth_provider.db.settings import settings
  from argilla.server.security.model import USER_USERNAME_REGEX, WORKSPACE_NAME_REGEX
  from .utils import get_or_new_workspace
label_desc: Use image node_id 4 for calling the UsersMigrator obj's underlying member method code with example usage: obj._user_workspace_names(user) and returns: unknown, workspace_names