Fix trigger filter for data overlay

Frank Winklmeier requested to merge fwinkl/athena:bsfilter into master

Rewrite the BSFilter algorithm to use the TrigDecisionTool for trigger-based event filtering on RAW. This ensure compatibility with past and future data. Change the --triggerBit transform argument from the CTP ID (240) to the CTP item name ("L1_ZB"), which is guaranteed to work also if the item ID changes.

Also apply some general code cleanups.

Closes ATLASSIM-5419.

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