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Initial attempt to quieten down Geant4 (ATLASSIM-7244)

John Derek Chapman requested to merge jchapman/athena:SimulationLogging_main into main

The idea here is to be able to reduce the verbosity of Geant4 for production jobs, while retaining it for test jobs.

This initial version reduces the log file size of the SimulationRun3FullSim CITest (50 events, 4 threads) from 23903 lines to 2374 lines. It introduces the Exec.QuietMode flag (True by default) to toggle the Geant4 output suppression. This flag could be used for other production steps also, so comments welcomed on the flag naming etc. also.

Edited by John Derek Chapman

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