HPCC-12163 DOCS:Document ECL Watch Workunit details

FIX HPCC-12163 DOCS:Document ECL Watch Workunit details
Add documentation for Workunit details in ECL Watch

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6507 from g-pan/H12163-WkUnDetails

HPCC-12163 DOCS:Document ECL Watch Workunit details

Reviewed-By: Jim DeFabia <james.defabia@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>