online: Rework STS hitfinder monitoring.

Rework STS hitfinder monitoring and fixes a memleak when collecting timing information.

added BugFix Online labels

requested review from @p.-a.loizeau

assigned to @fweig

Dear @v.friese, @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

approved this merge request

Confirmed that in my "standard but by hand" test no memory leak is reported anymore. Will rebase this once !1752 (merged) is merged

Sorry that I missed this MR on the day of the data taking, I read only the title and did not realize it could have saved us our memory leak troubles

added 44 commits

• 7a898c84...889fd9eb - 43 commits from branch computing:master
• 60f7e0b4 - online: Rework STS hitfinder monitoring.

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added 2 commits

• 9c182015 - 1 commit from branch computing:master
• a253e60c - online: Rework STS hitfinder monitoring.

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resolved all threads

enabled an automatic merge when the pipeline for a253e60c succeeds

merged