[hotfix] Log batch size in FlinkS3FileSystem instead of total

Author: rkhachatryan

flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/FlinkS3FileSystem.java

@@ -285,7 +285,8 @@ public void copyFiles(List<CopyRequest> requests, ICloseableRegistry closeableRe
                     || runningSizeFiles >= s5CmdConfiguration.maxBatchSizeFiles
                     || i == requests.size() - 1) {
                 LOG.info(
-                        "Copy {} files using s5cmd, total size: {}, args: {}",
+                        "Copy {} files out of {} using s5cmd, total size: {}, args: {}",
+                        batch.size(),
                         requests.size(),
                         runningSizeBytes,
                         artefacts);