fix(vitest): loosen onConsoleLog return type

[hi-ogawa]

Description

• close onConsoleLog should be typed false | undefined or boolean | undefined #5317

I think this is a minor paper cut and loosening it makes sense to allow something like:

onConsoleLog(type) {
  return type !== 'stderr';
}

Currently users need to rewrite it into a following, which seems unnecessary restriction. Also it seems some eslint rule doesn't like this form.

onConsoleLog(type) {
  if (type === 'stderr') {
    return false;
  }
}

I don't know about void vs undefined, so I kept void here.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[netlify]

✅ Deploy Preview for fastidious-cascaron-4ded94 canceled.

Name	Link
🔨 Latest commit	95674ac
🔍 Latest deploy log	https://app.netlify.com/sites/fastidious-cascaron-4ded94/deploys/65e66d5229f8d40008227632

[AriPerkkio]

I've also ran into this annoying type issue. Glad to see this fixed!