VP1BatchOnLatestEvent: migrated to xAOD::EventInfo

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-vp1batch into master

Switched from the legacy EventInfo to xAOD::EventInfo in VP1BatchOnLatestEvent. Also switched to ATH_MSG macros for messaging

CC @rbianchi

Edited by Vakhtang Tsulaia

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