Merge branch 'AddPyDumperToAthSimulation_ATLASSIM-3430_21.0' into '21.0'

Add Event/PyDumper package back into AthSimulation

See merge request !4660

Former-commit-id: 12baa3fe13c96c710d2fb96f6db833ac5536d5b7

Projects/AthSimulation/package_filters.txt

@@ -145,6 +145,7 @@
 + Event/EventTPCnv
 + Event/FourMom
 + Event/NavFourMom
++ Event/PyDumper
 + Event/xAOD/xAODBase
 + Event/xAOD/xAODCaloEvent
 + Event/xAOD/xAODCore