HPCC-10299 Support AppKey and ECL filters in WsWorkunits/WUQuery

In this fix, a user can use WsWorkunits/WUQuery to search ECL
Workunits which contain (wildcard match) specified AppKey/Data
attribute or ECL query text.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>
HPCC-10299 Revise based on review

Rename WUSFapplication to WUSFcustom;
Set WUSFcustom inside addWUQueryFilterApplication().
Merge pull request #5489 from wangkx/h10299

HPCC-10299 Support AppKey and ECL filters in WsWorkunits/WUQuery

Reviewed-By: Jake Smith <jake.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>