Fix a bug in Node <21 that prevented the normal operation of the request coalescer

[steveluscher]

Summary

There is a bug in the version of undici that ships with Node <21 that throws an unhandled exception when the reason property of an AbortSignal is a non-object. The request coalescer hits this bug because it uses a Symbol to differentiate between an internal abort and a user abort. undici chokes on that Symbol.

In this PR we capitulate and change it to an object.

See nodejs/undici#2597 for more detail about the bug.

Test Plan

In every version of Node from 18-21, undici handles an object correctly.

~/src/solana-web3.js-git/packages/rpc$ sudo n 21 && pnpm node
     copying : node/21.7.1
   installed : v21.7.1 (with npm 10.5.0)
Welcome to Node.js v21.7.1.
Type ".help" for more information.
> await fetch('http://localhost', { signal: AbortSignal.abort({}) });
Uncaught {}
>
~/src/solana-web3.js-git/packages/rpc$ sudo n 20
     copying : node/20.11.1
   installed : v20.11.1 (with npm 10.2.4)
~/src/solana-web3.js-git/packages/rpc$ pnpm node
Welcome to Node.js v20.11.1.
Type ".help" for more information.
> await fetch('http://localhost', { signal: AbortSignal.abort({}) });
Uncaught {}
>
~/src/solana-web3.js-git/packages/rpc$ sudo n 19 && pnpm node
     copying : node/19.9.0
   installed : v19.9.0 (with npm 9.6.3)
Welcome to Node.js v19.9.0.
Type ".help" for more information.
> await fetch('http://localhost', { signal: AbortSignal.abort({}) });
Uncaught {}
>
~/src/solana-web3.js-git/packages/rpc$ sudo n 18 && pnpm node
     copying : node/18.19.1
   installed : v18.19.1 (with npm 10.2.4)
Welcome to Node.js v18.19.1.
Type ".help" for more information.
> await fetch('http://localhost', { signal: AbortSignal.abort({}) });
Uncaught {}
>

Resolves #2325.

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[steveluscher]

• Fix a bug in Node <21 that prevented the normal operation of the request coalescer #2326 👈
• master

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🎉 This PR is included in version 1.91.2 🎉

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