Test that all three ErrorPolicy strings can report network errors.
Test that all three ErrorPolicy strings can report network errors.

This perhaps gives some reassurance the goals of issue #9142 are still
achievable, in the sense that network errors can be obtained from the
Promise returned by the useLazyQuery execution function, even if those
errors are not thrown (and the Promise is never rejected).

apollographql/apollo-client,apollographql/apollo-client