Fix filling of QA histos for online event builder

Setting to auto-merge as fix tested locally

added BugFix Online QA labels

assigned to @p.-a.loizeau

enabled an automatic merge when the pipeline for 94f36cfa succeeds

Dear @d.smith, @fweig,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged