hydra-eval-jobs: Mirror eval errors in STDERR

Otherwise, errors will not be shown to end-users, which makes debugging long evals pretty much impossible.

Created by  Samuel Dionne-Riel  on March 30, 2020
753QDZOOQTSO2IRPXD7FH43HLMQXCZ5KLM6IOSXN5YI5D4ZBJSIQC
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