fix: Fixed the issue that there is no running request when http2 goaway

[ShenHongFei]

This relates to...

onHttp2SessionGoAway throws an error

TypeError: Cannot read properties of undefined (reading 'onError')
    at Object.errorRequest (node:internal/deps/undici/undici:3935:13)
    at ClientHttp2Session.onHttp2SessionGoAway (node:internal/deps/undici/undici:5969:8)
    at ClientHttp2Session.emit (node:events:513:28)
    at ClientHttp2Session.emit (node:domain:489:12)
    at Http2Session.onGoawayData (node:internal/http2/core:683:11)
    at Http2Session.callbackTrampoline (node:internal/async_hooks:130:17)

The reason is const request = client[kQueue][client[kRunningIdx]] where request is empty.
Then I tried adding some console.log

function onHttp2SessionGoAway (errorCode) {
  ...

  // Fail head of pipeline.
  console.log('clinet[kRunningIdx]:', clinet[kRunningIdx])  // clinet[kRunningIdx]: 2
  console.log('clinet[kPendingIdx]:', clinet[kPendingIdx])  // clinet[kPendingIdx]: 2
  console.log('clinet[kQueue].length:', clinet[kQueue].length)  // clinet[kQueue].length: 2
  console.log('clinet[kQueue]:', clinet[kQueue])  // clinet[kQueue]: [null, null]
  
  const request = client[kQueue][client[kRunningIdx]]
  client[kQueue][client[kRunningIdx]++] = null
  util.errorRequest(client, request, err)  // throws "Cannot read properties of undefined"
  client[kPendingIdx] = client[kRunningIdx]

  assert(client[kRunning] === 0)

  ...
}

Rationale

fix this issue

Changes

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Breaking Changes and Deprecations

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[metcoder95]

Can you add a test for it?

[ShenHongFei]

I don't know how to construct a server to reproduce the http2 goaway situation here, and it's not easy to write a test case