Recovered online-trigger skimming in IDTIDE + Full replacement of AddItem to the new SlimmingHelper
We implemented a change that fixes the problem regarding the online-triggers in IDTIDE that was leading to empty Run-3 data files [https://its.cern.ch/jira/browse/ATLIDTRKCP-423].
We are therefore removing the offline-trigger-based skimming we adopted as an temporary hack in our previous merge-request [!57742 (merged)].
We plan to revisit this issue in the future and change the new hard-coded triggers to become trigger-chain independent, as this would involve making changes in our current prescales.
We also took the opportunity to include a new version of IDTIDE where the depracated AddItem method is fully replaced by the new SlimmingHelper.