Make passing an signal: AbortSignal.timeout to fetch implicitly set timeout: false

[Jarred-Sumner]

What does this PR do?

This makes passing an signal: AbortSignal.timeout to fetch implicitly set timeout: false

If you do

fetch(url, {signal: AbortSignal.timeout(60*1024*20)});

You expect the fetch call to timeout after 20 minutes. You don't expect it to timeout after 5 minutes because you forgot to set timeout to false.

How did you verify your code works?

[robobun]

^{Updated 7:25 PM PT - Jan 28th, 2025}

❌ @Jarred-Sumner, your commit 7589b86 has 1 failures in Build #10735:

• test/cli/install/bun-install-registry.test.ts - 1 failing on 🪟 2019 x64

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🧪   try this PR locally:

bunx bun-pr 16859