Replace node-fetch with native fetch in tests and docs

[vzaidman]

Summary:
Updating node-fetch to the latest version caused tests in packages/metro/src/integration_tests/__tests__/server-test.js to fail. Running each test case inside the file failed individually, but there seems to have been a race condition between the tests causing subsequent tests to fail with the following error:

FetchError: request to http://localhost:10028/import-export/index.bundle?platform=ios&dev=true&minify=false failed, reason: socket hang up

It happens because the "connection: close" header is removed in the latest version of node-fetch: node-fetch/node-fetch#1765 and can be fixed by adding this header manually to fetches.

fetch('path', {headers: {'Connection': 'close'}});

This diff introduces a workaround where we add that header, however fetch is expected to work even without it when the following bug is fixed: nodejs/undici#3492

Also, since node-fetch was only used in this one test, it was actually a good opportunity to remove it from the project's dependencies altogether.

Differential Revision: D61336391

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[robhogan]

Interesting, feels like a Node bug to me...

const {createServer} = require('node:http');

const port = 8080;
const url = 'http://localhost:' + port

async function main() {
    const server1 = createServer((req, res) => res.end());
    await new Promise(r => server1.listen(port, r));
    await fetch(url);
    await new Promise(r => setTimeout(r, 0));
    await new Promise(r => server1.close(r));

    const server2 = createServer((req, res) => res.end());
    await new Promise(r => server2.listen(port, r));
    await fetch(url); // Throws
    await new Promise(r => server2.close(r));
}

main();

node:internal/deps/undici/undici:13193
      Error.captureStackTrace(err);
            ^

TypeError: fetch failed
    at node:internal/deps/undici/undici:13193:13
    at async main (.../fetch-test.js:15:5) {
  [cause]: SocketError: other side closed
      at Socket.<anonymous> (node:internal/deps/undici/undici:6025:28)
      at Socket.emit (node:events:532:35)
      at endReadableNT (node:internal/streams/readable:1696:12)
      at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
    code: 'UND_ERR_SOCKET',
    socket: {
      localAddress: '::1',
      localPort: 61899,
      remoteAddress: undefined,
      remotePort: undefined,
      remoteFamily: undefined,
      timeout: undefined,
      bytesWritten: 338,
      bytesRead: 122
    }
  }
}

Node.js v22.3.0
``

[robhogan]

Opened nodejs/undici#3492

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This pull request has been merged in 60de111.