HPCC-11853 Add ECLWatch UI to call resetquerystats

On the Query Details page, a 'Reset' button is added to
send WsWorkunits an HTTP request of WUQuerysetQueryAction
with Action='ResetQueryStats'. The code of handling the
action is added to WsWorkunits.

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