21.2 MC truth classifier in MuonSelectorToolsTester

Magnar Kopangen Buggerequested to merge
mkbugge/athena:21.2-truthClassifierInMSTT into 21.2

This MR adds truth classification based on MCTruthClassifier to the output of MuonSelectorToolsTester. This can be useful for spotting problems related to prompt-muon efficiencies or "fake-muon" misidentification rates.

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