HLT: Mark IOVDbSvc folders as extensible in allowCOOLUpdates Modifier

Frank Winklmeierrequested to merge
fwinkl/athena:iovdbsvc_extensible into master

COOL folders that are supposed to be updated during the run need to be marked as extensible. If this has not been done when adding the folder via addFolder do it now. Fixes ATR-19393.

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