Fix legacy heavy ion egamma reconstruction

Fixing ART

  • remove SubtractedCaloClusterTopoGetter and egammaTopoClusterCopierCfg from legacy; the same algorithms are already in egammaReconstructionCfg which is also included in the same jobOptions
  • fix SubtractedCaloTopoClusters vs. SubtractedCaloTopoCluster; the plural is more intuitive and used in the CA, while the singular is used in the legacy setup. Also introduced a new flag, so the name usage is always consistent (in CA)

Tagging @stapiaar @mrybar

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