feat: support clean coverage directory before running tests

[9aoy]

Summary

support clean coverage directory before running tests.

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rstest-dev ready!

Name	Link
🔨 Latest commit	27c3810
🔍 Latest deploy log	https://app.netlify.com/projects/rstest-dev/deploys/68c27d3d5875b900083405b8
😎 Deploy Preview	https://deploy-preview-558--rstest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[Copilot]

Pull Request Overview

This PR adds support for a clean option to the coverage configuration that automatically cleans the coverage directory before running tests.

• Added a new clean boolean option to CoverageOptions with a default value of true
• Updated type definitions to properly handle the coverage configuration in project configs
• Integrated coverage cleanup functionality through a new core plugin

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/core/src/types/coverage.ts	Added clean boolean option to CoverageOptions
packages/core/src/types/config.ts	Updated type definitions to handle normalized coverage options
packages/core/src/config.ts	Set default value for clean option to true
packages/core/src/core/rsbuild.ts	Added coverage core plugin and command condition
website/docs/*/config/test/projects.mdx	Updated documentation to exclude coverage from ProjectConfig
e2e/test-coverage/index.test.ts	Updated test to verify coverage directory cleaning

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}