Fix incorrect response object being emitted on redirect

Changes the argument emitted with the redirect event to a Supertest Response object instead of an unwrapped IncomingMessage.

Closes #1760

Checklist

[x] I have ensured my pull request is not behind the main or master branch of the original repository.
[x] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
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