Sweeping !42183 from 21.3 to 21.9. TrigT1CaloFexPerf: Adding Phase II ffex trigger EM algorithm

Atlas Nightlybuildrequested to merge
cherry-pick-132f43076a5-21.9 into 21.9

TrigT1CaloFexPerf: Adding Phase II ffex trigger EM algorithm

See merge request !42183 (merged)

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