ATR-25238: make probe legs explicit

Stefanie Morgensternrequested to merge
shanisch/athena:ATR-25238_probeLegExplicit into master
  • add _probe to tau leg for electron+tau chains
  • add _probe to tau leg for muon+tau chains
  • make L1 threshold explicit for probe
  • update references
Edited by Stefanie Morgenstern

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