Allow creating SEASONAL reservations in GQL create_staff_reservation

Author: ranta

api/graphql/types/reservation/serializers/staff_create_serializers.py

@@ -205,6 +205,7 @@ def validate_type(self, reservation_type):
             ReservationTypeChoice.BLOCKED.value,
             ReservationTypeChoice.STAFF.value,
             ReservationTypeChoice.BEHALF.value,
+            ReservationTypeChoice.SEASONAL.value,
         ]
 
         if reservation_type not in allowed_types:

tests/test_graphql_api/test_reservation/test_staff_create.py

@@ -441,7 +441,7 @@ def test_reservation__staff_create__reservation_type_normal_not_accepted(graphql
     response = graphql(CREATE_STAFF_MUTATION, input_data=data)
 
     assert response.error_message() == (
-        "Reservation type NORMAL is not allowed in this mutation. Allowed choices are BLOCKED, STAFF, BEHALF."
+        "Reservation type NORMAL is not allowed in this mutation. Allowed choices are BLOCKED, STAFF, BEHALF, SEASONAL."
     )