fix: seed nodes crashing from ending connections

[tegefaulkes]

Specification

Due to recent changes the seed nodes have started crashing. The cause of the crash seems to be when a node connection to the seed node shuts down. So far I've seen it when running the testnetConnection.test.ts tests, the first run of the test succeeds and the 2nd tends to fail due to the seed node crashing. So far as I can tell, the clean up stage of the test where we kill the agent process with a SIGINT signal is when it happens.

On the seed node side of things we see the following error.

{
    "type": "TypeError",
    "data": {
        "message": "Cannot read properties of null (reading 'finishShutdown')",
        "stack": "TypeError: Cannot read properties of null (reading 'finishShutdown')\n    at JSStreamSocket.finishShutdown (node:internal/js_stream_socket:160:12)\n    at Immediate.<anonymous> (node:internal/js_stream_socket:234:12)\n    at processImmediate (node:internal/timers:466:21)"
    }
}

A cursory search found this issue nodejs/node#35695 which indicates this may be a bug in nodes HTTP implementation. Further investigation is needed.

Additional context

• Related ci: merge staging to master #474 (comment)

Tasks

1. Find the core cause of the problem
2. fix the problem

[CMCDragonkai]

Need to review this as part of #551.

[tegefaulkes]

This Issue relates to the old test-net deployment and old network stack.

After converting to js-quic this is no longer relevant.