Fixed clang warnings about unused private data members

Vakhtang Tsulaiarequested to merge
tsulaia/athena:main-clang into main

Affected packages:

  • DetectorDescription/Identifier/Identifier (cc. @sroe)
  • Trigger/EFTracking/FPGATrackSim/FPGATrackSimAlgorithms (cc @brosser)

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