add algoVersion to c++ class for eEM thresholds

Will Buttingerrequested to merge
will/athena:24.0-algoVersion_eEM_cpp into 24.0

This adds the c++ implementation for getting the algoVersion attribute of the eEM threshold extra info from the menu. Needed in the online control software for eFEX.

Related to https://its.cern.ch/jira/browse/ATR-30871

Edited by Will Buttinger

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