[core] Use the ConnectWithoutRetries error message (#12732)

src/ray/gcs/redis_context.cc

@@ -333,7 +333,7 @@ Status ConnectWithRetries(const std::string &address, int port,
       break;
     }
     if (*context == nullptr) {
-      RAY_LOG(WARNING) << "Could not allocate Redis context, will retry in "
+      RAY_LOG(WARNING) << errorMessage << " Will retry in "
                        << RayConfig::instance().redis_db_connect_wait_milliseconds()
                        << " milliseconds.";
     }