Improve truth handling in digitization configuration

Tadej Novakrequested to merge
tadej/athena:digi-truth into 22.0

Improve truth handling in digitization configuration:

  • rename Digitization.TruthOutput to Digitization.EnableTruth to also use it for algorithm scheduling
  • disable some algorithms/tools when running with this flag disabled (similar to what is done in legacy config)
  • rename Digitization.DoDigiTruth to Digitization.DoHardScatterTruth

/cc @jchapman @tlari @tcuhadar

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