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 whether the WUID has been included on the Activity page.
If not, find out @ClusterName of the WU. Using the ClusterName,
find out the cluster type and queue name, and show the WU under
that cluster.

Signed-off-by: Kevin Wang <kevin.wang@lexisnexis.com>