response status text is incorrect in fetch/content-length/api-and-duplicate-headers.any.js

[CYBAI]

Currently, we failed at the first assertion of statusText in this test.

After looking into it, the root cause is that we're using the canonical_reason in http crate which will always return the standardised reason-phrase (e.g. OK for 200).

However, as mentioned in hyperium/http#345 (comment), reason-phrase doesn't exist in HTTP2 or HTTP3; because of this, http crate might not support custom reason phrase.