fix(runtime-sdk): do not include HTTP body for null body status codes

[ryanking13]

I already applied the same fix in asgi.py in #148, this applies the same fix to wsgi.py

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The change is clean and consistent with the existing ASGI implementation. The logic is correct:

1. NULL_BODY_STATUSES is the same set used in asgi.py ({101, 103, 204, 205, 304}), matching the Fetch spec's null body statuses.
2. The early return with Response.new(None, ...) prevents attaching a ReadableStream body to responses that must not have one.
3. on_close() is correctly called before the early return, ensuring the WSGI iterable and wsgi.input are properly closed (matching the cleanup contract).
4. The code variable extraction is a sensible refactor to avoid parsing the status code twice.

No logic bugs, security issues, backward compatibility concerns, or other actionable problems.

LGTM

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