message: Require ECN interop tests to pass
diff: "ecn": {
  "aioquic": [],
  "kwik": [],
  - "lsquic": [],
  + "lsquic": ["client"],
  "msquic": [],
  "mvfst": [],
  "neqo": [],
  - "ngtcp2": [],
  - "picoquic": [],
  + "ngtcp2": ["client"],
  + "picoquic": ["client"],
  "quic-go": [],
  "quiche": [],
  "quicly": [],
  