Fixed clang warnings in 2023-12-01T2101

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

ActsTruth:

  1. ElasticDecayUtil.icc: added missing std::endl
  2. TrackToTruthAssociationAlg.cxx: removed one unused lambda capture

TrigT1Monitoring:

  1. Removed unused variables and private data members

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