Move provisioning proxy steps to the new LSO endpoint

Move away from GÉANT-specific API endpoints in LSO, and instead make use of the generic one

gso/services/provisioning_proxy.py

@@ -6,7 +6,6 @@
 import json
 import logging
 from functools import partial
-from http import HTTPStatus
 from typing import Any
 
 import requests
@@ -74,10 +73,7 @@ def _send_request(operation: CUDOperation, endpoint: str, parameters: dict, call
     elif operation == CUDOperation.DELETE:
         request = requests.delete(url, json=parameters, timeout=10000)
 
-    if not HTTPStatus.OK <= request.status_code < HTTPStatus.MULTIPLE_CHOICES:
-        # :term:`LSO` has returned a status code that is outside the 2xx range, and has therefore failed
-        logger.debug(request.content)
-        raise AssertionError(request.content)
+    request.raise_for_status()
 
 
 _send_post = partial(_send_request, CUDOperation.POST)