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Fixing wrong A/CSideYOffset values of Muon Stations for 2026 MC Productions

Erika De Luciarequested to merge
upgrade/edelucia_MuonYposFix_master into upgrade/master

These are the changes needed in the Muon geometry `MuonParameters.xml' to fix the wrong A/CSideYOffset values for Muon Stations, as discovered with the Muon alignment lhcb-conditions-database!199 (merged) (merged).

This bug affects Run3 Muon geometry description only and both DetDesc and DD4hep descriptions. See slides presented at the Simulation meeting https://indico.cern.ch/event/1580357/contributions/6660608/attachments/3132482/5557329/MuonDeLuciaSimMeet_9Sep2025.pdf

To be used for 2026 and 2025 MC production campaigns.

In the Detector project we have lhcb/Detector!837

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