Implement contract document download functionality and enhance clearance review status checks

- Added methods to assert clearance reviewable, finalizable, and uploadable statuses in the ContractClearanceService.
- Introduced a new endpoint in ContractsController for downloading contract PDFs.
- Implemented download functionality in the contracts service for both backoffice and portal applications.
- Updated UI components to include download buttons for contract PDFs in relevant pages.
- Enhanced contract request and view pages to support contract document downloads.

apps/edr-freight-web/portal/src/services/contracts.service.ts

@@ -203,6 +203,13 @@ export const contractsService = {
     return data.data ?? data;
   },
 
+  downloadContractDocument: async (id: string): Promise<Blob> => {
+    const { data } = await client.get(C.CONTRACT_DOCUMENT(id), {
+      responseType: "blob",
+    });
+    return data;
+  },
+
   signContract: async (
     id: string,
     payload: SignContractPayload,