Add xAODEventInfoAthenaPool package to AthGeneration and AthSimulation projects

Currently the xAODEventInfoCnvTest fails in the AthGeneration and AthSimulation nightlies. This is because these projects do not properly support reading/writing xAOD::EventAuxInfo_v2. Adding the Event/xAOD/xAODEventInfoAthenaPool package to these projects should fix this. And will be required anyway for when we eventually switch simulation and generation jobs to writing xAOD::EventInfo rather than EventInfo. Should fix ATLASSIM-4525.