HPCC-11539 Add Owner/State into ESP WUShowScheduled Response

Also add State as a filter of WUShowScheduled.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
Looks ok, the additional properties it's accessing in the workunits it opens are at the top-level/cheap to access.
It calls workunit->aborting() now, but that should be 'free' unless it was aborting, in which case it involves an extra connection - but still ok.