Fix cronjob test artifacts path

Francois Eleouetrequested to merge
fix-cronjob-test-artifacts into main

What does this MR do and why?

Fix artifact path for cronjob tests: https://gitlab.com/sylva-projects/sylva-core/-/jobs/8828166496#L111

As we can see, we have to "Ensure that the artifact path is relative to the working directory"

cronjob_report.txt is properly retrieved here, but that's not the case in downstream pipelines.

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