HPCC-10352 Pass PID in the web link for downloading eclagent log

The existing download link for eclagent log does not work because
PID is not set through the web link for downloading eclagent log.
In this fix, the PID is set into the web link.
Merge pull request #5095 from wangkx/h10352a

HPCC-10352 Pass PID in the web link for downloading eclagent log

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>