fix summary task in the system-level test workflow

[VeraChristina]

The summary task in the system-level test workflow fails because the logs we upload are too big: https://github.com/ecmwf/anemoi/actions/runs/23542627603

We'll need to rethink what we upload and potentially make the tracksuite functionality more configurable, see ecmwf/tracksuite#34

[github-actions]

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