HPCC-9686 Add ability to fetch named results to ESPWorkunit

Fixes HPCC-9686

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4979 from GordonSmith/HPCC-9686

HPCC-9686 Add ability to fetch named results to ESPWorkunit

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>