HPCC-9332 Recursively add input files for other non-persist workflow items

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4397 from ghalliday/issue9332

HPCC-9332 Recursively add input files for other non-persist workflow items

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>