temp fix for lumi report on workloadsummary

temp fix for #5216 
If you want it to be performant and without dup lumi protection, then I would only remove this line:
https://github.com/ticoann/WMCore/blob/temp_fix_lumi_update_ws/src/python/WMComponent/TaskArchiver/TaskArchiverPoller.py#L720
Otherwise, a bit less performant but with dup lumi protection, remove the same line (720) and add set(run.lumis) to the for in L719. What do you think?