undici instrumentation can add duplicate trace-context headers, which can break Elasticsearch about apm-agent-nodejs HOT 2 CLOSED

  const { statusCode, body } = await undici.request(url, {
    headers: {
      foo: 'bar',
      traceparent: 'asdf',
    },
  });

server req: GET /ping {
  host: 'localhost:51272',
  connection: 'keep-alive',
  foo: 'bar',
  traceparent: 'asdf, 00-c595479ad31182af71f0f4503872a2bc-99600c4e4ad62c2b-01',
  tracestate: 'es=s:1'
}