Include last message from genserver shut down

[tombruijn]

It would be great if any last message sent to a process would be included in the error.
It is present in the logs, but not in the error

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[tombruijn]

Noemi reached out to this person to ask if they can try out the genserver helper. Intercom link: https://app.intercom.com/a/inbox/yzor8gyw/inbox/admin/5246522/conversation/16410700322943#part_id=comment-16410700322943-21909561042