Ensure http response wrapper always sets a statusCode #2822
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If a wrapper doesn't write anything, we don't have any status code available. In which case we can assume it is going to be 200.
This behavior is also what the net/http library assumes if the response writer is a flusher: https://cs.opensource.google/go/go/+/refs/tags/go1.19.1:src/net/http/server.go;l=1702
Closes #2821.