frontend-grpc: use provided archiveReportURL AS-IS
The original gRPC based frontend-grpc was assuming that the Archive request will generate the archiveId. As a result, the archiveReportURL that sent from the storage system could not include the required the archiveId. Thus the final archiveReportURL is built on in the frontend-grpc
Since commit 13b43466 have introduced a Create step, the storage system is able to fully build the archiveReportURL on it's side and let frontend-grpc to use the provided report URL as-is.