Add end-to-end tests for import corridor flows

- Implement full train import journey with six container bookings filling a 54-wagon train.
- Create tests for split offer and rebooking scenarios, handling payment expiry and waiting list promotions.
- Add tests for handling waiting bookings expiration when the train is full.
- Implement tests for reopening booking windows after expired reservations.
- Seed database with necessary corridor data for import flows, including yards, container types, locomotives, and rates.

apps/edr-freight-api/src/seed/freight-permissions.registry.ts

@@ -302,8 +302,6 @@ export const SCHEDULING_EXTRA_PERMISSIONS: FreightPermissionSeed[] = [
 
 // L. Administration & settings (split from the coarse admin umbrella)
 export const CONFIG_SETTINGS_PERMISSIONS: FreightPermissionSeed[] = [
-  perm('b3a00001-0001-4000-8000-000000000001', 'edr_freight_app:config:contract_validity:view', 'View contract validity periods'),
-  perm('b3a00001-0001-4000-8000-000000000002', 'edr_freight_app:config:contract_validity:manage', 'Manage contract validity periods'),
   perm('b4a00001-0001-4000-8000-000000000001', 'edr_freight_app:settings:file_upload:view', 'View file-upload settings'),
   perm('b4a00001-0001-4000-8000-000000000002', 'edr_freight_app:settings:file_upload:manage', 'Manage file-upload settings'),
   perm('b4b00001-0001-4000-8000-000000000001', 'edr_freight_app:settings:dropdown:view', 'View dropdown settings'),
@@ -594,12 +592,6 @@ export const FREIGHT_PERMS = {
     cancel: 'edr_freight_app:warehouse_fee_invoices:cancel',
     pay: 'edr_freight_app:warehouse_fee_invoices:pay',
   },
-  config: {
-    contractValidity: {
-      view: 'edr_freight_app:config:contract_validity:view',
-      manage: 'edr_freight_app:config:contract_validity:manage',
-    },
-  },
   settings: {
     fileUpload: {
       view: 'edr_freight_app:settings:file_upload:view',