fix: colors on `forks` pool

[AriPerkkio]

Description

• Fixes https://github.com/vitest-dev/vitest/issues/7042
• Requires https://github.com/tinylibs/tinyrainbow/pull/3

This should probably be ported to v2 as colors are not working in latest there.

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[AriPerkkio]

Windows CI is failing. It's like it didn't set isatty(1) as false when forked process's stdout is captured into buffer. 🤔

Anyone with Windows machine to check what following script prints?

import { writeFileSync } from "node:fs";
import { fork } from "node:child_process";
import { setTimeout } from "node:timers/promises";
import { isatty } from "node:tty";

console.log("main thread", isatty(1));

writeFileSync(
  "./worker.mjs",
  `
import { isatty } from "node:tty";

console.log("process", isatty(1));
`.trim(),
  "utf8"
);

const subprocess = fork("./worker.mjs", { stdio: "pipe" });
subprocess.stdout.pipe(process.stdout);
subprocess.stderr.pipe(process.stderr);

await setTimeout(3_000);
subprocess.kill();

[userquin]

[AriPerkkio]

It's likely caused by colors being enabled on based on platform here: https://github.com/tinylibs/tinyrainbow/blob/550fbcdc56b9b2d69230e73b48e3d7ba0dc2e60c/src/index.ts#L91

I'll add skip to windows on tests.