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/backoffice/src/services/contracts.service.ts

@@ -159,6 +159,13 @@ export const contractsService = {
     return unwrap(response.data) as ContractView;
   },
 
+  downloadContractDocument: async (id: string): Promise<Blob> => {
+    const response = await client.get(C.CONTRACT_DOCUMENT(id), {
+      responseType: "blob",
+    });
+    return response.data as Blob;
+  },
+
   signContract: (id: string, payload: SignContractPayload) =>
     postContract<Freight.IContract>(C.CONTRACT_SIGN(id), payload),