fix: normalize <rootDir> in windows

[9aoy]

Summary

fix: normalize <rootDir> in windows

Related Links

Checklist

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

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[Copilot]

Pull Request Overview

This PR adds end-to-end tests for the <rootDir> placeholder functionality in rstest configuration. The tests verify that <rootDir> correctly resolves paths in both include and exclude patterns.

Key changes:

• Adds a test suite that validates <rootDir> pattern matching with fixture files
• Creates a test configuration using <rootDir> in include/exclude patterns
• Provides fixture test files to verify selective test file execution

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
e2e/rootDir/index.test.ts	Main test file that runs rstest CLI with <rootDir> configuration and validates execution
e2e/rootDir/fixtures/rstest.config.ts	Test configuration demonstrating <rootDir> usage in include/exclude patterns
e2e/rootDir/fixtures/index1.test.ts	Fixture test file intended to be excluded by the configuration
e2e/rootDir/fixtures/index.test.ts	Fixture test file intended to be included and executed

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