Muon Run3 ART: use autoconfiguration in Reco_tf

Nicolas Koehlerrequested to merge
nkoehler/athena:muArt213 into 21.3

Hi,

when !38929 (merged) is merged, everything will be automatically configured during Reco_tf also for Run3 layouts, thus, adapting ART to use it.

Best, Nico

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