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switch to gaussian seeder to test updates in MR !31636

Nicholas Styles requested to merge nstyles/athena:21.9-textGSOptimization into 21.9

As above. Switching to Gaussian seeder to allow checks on CPU use in high pile-up following optimizations. Plan is not (currently) to stick with this option longer-term unless a) the CPU performance is reasonable b) the physics performance shows a noticeable improvement. Point b) can probably only be assessed at a later date, and so this change will likely be reverted once monitoring plots have been checked.

FYI @goblirsc @npetters @ncalace @tstreble @vcairo @kostyuk

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