feat: provide governed notification email delivery

src/govoplan_mail/backend/delivery_outbox.py

@@ -7,7 +7,7 @@ from collections import Counter
 from datetime import datetime, timedelta, timezone
 from typing import Any
 
-from sqlalchemy import and_, or_, select
+from sqlalchemy import or_, select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session