During dark launch of remote codejail, we want to ensure we always run both
local and remote execution -- otherwise we're missing data for the remote
side in an important situation.
This will help answer the question of whether the unexpected exception
happens on both sides, even though it may not look exactly the same due to
differences in how unexpected errors are handled.
An example input that provokes this in unsafe execution mode is
`raise BaseException("hi")`; in safe execution mode, printing to
`sys.__stdout__` should also produce an appropriate error.
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