add error code to egress info

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 01f3344aeb8e042abe7bf3159c8160c2ddffe6cf

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[davidzhao]

@frostbyte73 can you add a changeset please? https://github.com/livekit/protocol/pull/714#issuecomment-2105314407