IOVDbSvcConfig: move AthenaPoolCnvSvc configuration

Frank Winklmeier requested to merge fwinkl/athena:iovdbsvc into 23.0

Move the AthenaPoolCnvSvc configuration from addFolderList to the main IOVDbSvcCfg function. The latter is cached and called much less frequently than addFolderList.

In a trigger job, this was being called 33k times and this results in about 10 seconds configuration speedup.

@wlampl @tbold

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