HPCC-11775 Improve efficiency of WUiterate in Sasha

WUiterate which scans and filters archives and online workunits,
accessed Dali in an inefficient way, especially in the case of
requesting a single workunit.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Yes... except the after/before processing can modify mask *after* unfiltered is set up.  So either unfiltered needs updating, or the test needs to revert.