HPCC-8817 Fix hthor running WU not shown on Activity page

Using existing code, running hthor WU is not shown on EclWatch
Activity page since EclWatch trys to read the WU from /Status/
Servers/Server/@name='a_hthor.agent' and the WU is not list there.
But, the WU is list under /Status/Servers/Server/@name='ECLagent'.
This fix reads a WU from /Status/Servers/Server/@name='ECLagent',
find out WU information using WUID, Check if the @ClusterName of
the WU is an HThor, and if yes, display it under the HThor .agent.


Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>