HPCC-10774 In Roxie "workunit" mode, all files should be resolved dynamically

Part of the "deprecate hthor" work.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #5335 from richardkchapman/roxie-workunit-dynamic

HPCC-10774 In Roxie "workunit" mode, all files should be resolved dynamically

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>