remove obsolete config files from LArCondAthenaPool and LArDetMgrDetDescrCnv

Walter Lamplrequested to merge
wlampl/athena:rm_LArDetDescCnvPy into 24.0

remove obsolete config files from LArCondAthenaPool and LArDetMgrDetDescrCnv

This entirely removes the package LArDetMgrDetDescrCnv

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