fix(coverage): support overriding exclude

[AriPerkkio]

Description

• Fixes coverage.exclude should be fully configurable #5965

Previously Vitest did not allow user to override default coverage.exclude. In cases like #5964 this caused issues where users were completely unable to get coverage of files that were located in dist/**, as defaults were hard-coded and didn't allow overrides. Now Vitest allows users to completely override coverage.exclude.

This option overrides all default options. Extend the default options when adding new patterns to ignore:

import { coverageConfigDefaults, defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    coverage: {
      exclude: ['**/custom-pattern/**', ...coverageConfigDefaults.exclude]
    },
  },
})

https://vitest.dev/config/#coverage-exclude

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:.

[AriPerkkio]

/ecosystem-ci run

[vitest-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
aria-live-capture	✅ success
nuxt	❌ failure
nuxt-test-utils	❌ failure
elk	✅ success
effect	❌ failure
zustand	✅ success
vue	✅ success
vite	✅ success
vitest-vscode	❌ failure
vitest-sonar-reporter	✅ success
vitest-github-actions-reporter	✅ success
vitest-browser-simple	✅ success
vitest-browser-examples	❌ failure
vitest-coverage-large	✅ success
vitest-reporters-large	✅ success