fetch() network failures reject with Error instead of TypeError #7195

On workerd 1.20260828.1:

try {
  await fetch("http://127.0.0.1:1/");
} catch (error) {
  console.log(error.name, error instanceof TypeError, error.message);
  // Error false Network connection lost.
}

The Fetch standard requires network errors to reject with a TypeError.

workerd currently maps all DISCONNECTED exceptions to a plain Error here.

Related:

• Correct Cloudflare network error detection sindresorhus/is-network-error#13
• Workers error docs don't include the trailing ..