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.

(cherry picked from commit 76299b9174d7cba06427220166dc4707b43d407d)

Created by  Samuel Dionne-Riel  on March 30, 2020
KFP5NRCZKWI7ZASUOAYBW3WNSOG4P26GAMHIRRBE26BKOCZSTGKAC
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