HPCC-11748 Fix WsDFU.DFUQuery not return compressed file size

The existing WsDFU.DFUQuery does not return compressed size. That
is caused by reading a wrong property tree of a logical file. It
is fixed now. The code of WsDFU.DFUFile is changed to return
prefix, nodegroup, and NumParts, which are the same as
WsDFU.DFUQuery.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
Merge pull request #6266 from wangkx/h11748

HPCC-11748 Fix WsDFU.DFUQuery not return compressed file size

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>