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FCS_StepInfoSD: migrated to reading CaloDetDescrManager from the Condition Store

Vakhtang Tsulaia requested to merge tsulaia/athena:master-fcs_stepinfosd into master

This is part of the ongoing migration of all clients of the CaloDetDescrManager.

In the new implementation FCS_StepInfoSD accesses CaloDetDescrManager using ReadCondHandle. In order to avoid performance penalties, and assuming that the Calo manager needs to be retrieved only once per job, the ReadCondHandle is used only once and then the retrieved pointer is cached using CxxUtils::CachedPointer

CC @jchapman @ahasib @mfauccig @cyoung

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