Update G4AtlasAlg to set the xAOD::EventInfo error state
Now that Simulation jobs write xAOD::EventInfo rather than legacy EventInfo in master. It is possible to set the xAOD::EventInfo error state in a less hacky way that was used for EventInfo. Follows on from !50332 (merged).
In future it would be nice to be able to set the error state in the ISF SimKernel(MT) algorithm also, but that needs a bit more thought about how to propagate the condition from the individual simulators.