fix: move calendar_sync_utils to services/ and remove sys.path.insert hacks from all calendar sync steps

src/steps/advoware_cal_sync/calendar_sync_event_step.py

@@ -24,10 +24,7 @@ from googleapiclient.errors import HttpError
 from google.oauth2 import service_account
 import redis
 
-import sys
-from pathlib import Path
-sys.path.insert(0, str(Path(__file__).parent))
-from calendar_sync_utils import (
+from services.calendar_sync_utils import (
     connect_db,
     get_google_service,
     log_operation,