AthenaCommon: Remove setting of CoreDumpSvc.FatalHandler

Frank Winklmeierrequested to merge
fwinkl/athena:fatalhandler into master

Follow-up to !35076 (merged) and ATEAM-629 where we removed the explicit setting of CoreDumpSvc.FatalHandler in various job options. However, athena.py is setting this value to -1 (only handle SIGINT) by default and this leads to missing stacktraces for real crashes (e.g. ATR-21816). Not clear why this setting was chosen as a default in athena.

Edited by Frank Winklmeier

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