HPCC-11637 Avoid multiple concourrent ECLWatch onActivity queries

Add a critical section block to allow only one thread to build
onActivity response; move the code of setting Activity response
into one function which is called after all of the response
information are collected; store the information (and information
collect time) into one WsSMC data member; reuse the information
if another Activity request comes through shortly after a recent
request.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
This really should be connected to once, not on each request.  Each connection to dali is relatively expensive.

Can the environment change while ESP is alive?  If not then quite a lot of the information could be processed once at startup.