EventInfoTagBuilder: Conditionally initialize ReadHandleKey
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Follow up of !43016 (closed). The per-event WARNING
SGInputLoader 17 1 WARNING unable to find proxy for ( 'AthenaAttributeList' , 'StoreGateSvc+Input' )
came from a ReadHandleKey to the input AttributeList that should be ingnored if the input is ByteStream. This MR fixes this issue.