HPCC-12565 Add test case for regression suite option

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6631 from ghalliday/issue12565

HPCC-12565 Add test case for regression suite option

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>