HPCC-9305 Auto open DFU Workunits on file action

Fixes HPCC-9305

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4392 from GordonSmith/HPCC-9305

HPCC-9305 Auto open DFU Workunits on file action

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>