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TrigHLTJetHypo: Use std::set less

Adam Edward Barton requested to merge abarton/athena:JetSet into 23.0

@smh 's profiles show TrigHLTJetHypo spending a large amount of time in std::set this seems unnecessary. I have reworked FastReducer to use the slow std::set less.

This should probably be checked quite carefully and maybe more optimizations can be considered.

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