Replace MuonIdHelpers with MuonStationIndex in AthGeneration project

John Derek Chapmanrequested to merge
jchapman/athena:MuonStationIndexAthGeneration_master into master

After !31213 (merged) was merged then xAODMuon depends on the MuonStationIndex package rather than the MuonIdHelpers package, so the latter can be replaced by the former in Projects/AthGeneration/pacakage_filters.txt. Relates to AGENE-1787.

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