fix(ext/node): pass URL to kOnHeadersComplete when request has no headers (#33831)

## Summary

Enables `test-http-parser` in node_compat suite.

## Test plan
- [x] `cargo test --test node_compat -- test-http-parser`

Co-authored-by: divybot <divybot@users.noreply.github.com>
Co-authored-by: Divy Srivastava <me@littledivy.com>