Fixed clang warnings in two packages

Vakhtang Tsulaiarequested to merge
tsulaia/athena:main-clang into main
  1. PhysicsAnalysis/JetTagging/JetTagValidation/JetTagDQA

Removed unused private data members

  1. LArCalorimeter/LArClusterCellDumper/LArClusterCellDumper

Added missing override keyword. Removed unused local variables

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