TrigInDetValidation: use grid dataset for cosmics data test

Bertrand Martin Dit Latourrequested to merge
martindl/athena:24.0_ART_ID into 24.0

Hello,

As discussed in ATR-26472, we now have an option that allows ART to submit a single grid job when running over a dataset that contains several LBs. We can therefore use art-input for the cosmics data test, and avoid stressing cvmfs (no need to read 4 files of 1 GB).

Cheers, Bertrand

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