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Force McEventCollection merging to run before ID and Muon Digi in MT Overlay

John Derek Chapman requested to merge jchapman/athena:OverlayMTSchedulingWorkaroundOldStyle_master into master

The hard-scatter and background McEventCollection objects are merged in Overlay jobs. This merging has to occur before the collection is accessed via the HepMcParticleLink objects owned by ID and Muon SimHits. As the dependency is not explicit it is not picked up by the MT scheduler. Therefore the dependency has to be added manually to affected Algorithms. This is the same fix as !30525 (merged), but for the old-style rather than CA-based configuration.

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