fix linter errors

edge_cloud_management_api/models/federation_manager_models.py

-from pydantic import BaseModel, Field
+from pydantic import BaseModel #Field
 from typing import List, Optional
 
 

edge_cloud_management_api/services/federation_services.py

+import os
 import requests
 from requests.exceptions import Timeout, ConnectionError
 from edge_cloud_management_api.configs.env_config import config
 from edge_cloud_management_api.managers.log_manager import logger
+from edge_cloud_management_api.services.pi_edge_services import PiEdgeAPIClientFactory
+
+
 
 class FederationManagerClient:
     def __init__(self, base_url=None):