TrackParticleAssociationConfig/RecoSteering tidy

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:TrackParticleAssociationAlg_tidy into master
  • Create a single fragment to call from RecoSteering for doing the TrackParticleAssociation Configuration
  • Move the NegativeCluster thinning together with the other ones.

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