Some of the calls to `safe_exec` were missing the `limit_overrides_context`
parameter. This normally conveys the course key to codejail so that we can
give some courses different resource limits, but it's also valuable for
diagnosing codejail issues in logs and other telemetry.
I wasn't able to test all of these paths manually, but the utility function
`get_course_id_from_capa_block` will swallow errors, so the situation
should be no worse if the `LoncapaResponse.capa_block` field has something
unexpected.
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