fix: make with_halo2_pk panic on duplicate key #2324
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with_halo2_pk silently ignored errors from set_halo2_pk, even though the docstring explicitly says it should panic if Halo2 keygen has already been called. This also diverged from the pattern used by with_app_pk and with_agg_pk, both of which panic when their respective keys are already set.
Update with_halo2_pk to panic on a failed set_halo2_pk call, restoring the documented behavior and making the builder-style API consistent.