test: fix unstable coverage tests

[9aoy]

Summary

fix unstable coverage tests due to clean coverage directory conflict.

Related Links

Checklist

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

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[Copilot]

Pull Request Overview

This PR fixes unstable coverage tests by disabling automatic cleanup of coverage files across multiple test configuration files. The change prevents interference between test runs by preserving coverage artifacts.

• Adds clean: false configuration to all test coverage fixtures
• Ensures coverage files persist between test runs to prevent flaky behavior

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rstest.thresholds.config.ts	Disables coverage cleanup for threshold testing
rstest.skipFull.config.ts	Disables coverage cleanup for skipFull reporter testing
rstest.perFileThresholds.config.ts	Disables coverage cleanup for per-file threshold testing
rstest.include.config.ts	Disables coverage cleanup for include pattern testing
rstest.globThresholds.config.ts	Disables coverage cleanup for glob threshold testing

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