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Adding Calorimeter isolation to photon triggers

Fernando Monticelli requested to merge fernando/athena:TrigPhotonIso into master

This is to add calorimeter isolaton to photon trigger chains disussed in ATR-20756. To do so:

  • Calorimeter isolation Tool had to be instantiated and some other tools and configured properly for use in HLT
  • This includes an optional flag for CaloIsolationTool so it can do initialize(false) on readhandles
  • IsolationBuilder algorithm added as last algorithm in the photon trigger sequence
  • Next is configure the menu and hypo so to apply cut on this variable if chain name contains icalo*
  • ART tests passed locally

Pinging @jmasik @bernius @cjmeyer and @dbakshig

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