Remove hydra-eval-guile-jobs

This hasn't been used in a long time (Guix uses its own CI system), and it probably doesn't work anymore.

(cherry picked from commit 23c9ca3e94669087d463642baea0cf35a0b8d72f)

Created by  Eelco Dolstra  on February 15, 2020
QGLBQ5IOVSMBQRXXHO4LOJG4A7V3HSUZESCP2N235A7L4VVOBKCQC
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