RefService: implement ListRefs
Despite the generic name, this gRPC method was added to protocol fairly recently (version v14.2.0).
It has no caller in the Rails app as of v14.5.2, so low priority
Despite the generic name, this gRPC method was added to protocol fairly recently (version v14.2.0).
It has no caller in the Rails app as of v14.5.2, so low priority