test: use Rstest as Rspress's test framework

[9aoy]

Summary

use Rstest as Rspress's test framework.

Related Issue

Checklist

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

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Rsdoctor Bundle Diff Analysis

📁 web

Path: website/doc_build/web/rsdoctor-data.json

📌 Baseline Commit: 47112bc9ac | PR: #2863

Metric	Current	Baseline	Change
📊 Total Size	14.5 MB	14.5 MB	0 B (0.0%)
📄 JavaScript	13.9 MB	13.9 MB	0 B (0.0%)
🎨 CSS	113.9 KB	113.9 KB	0 B (0.0%)
🌐 HTML	0 B	0 B	N/A
📁 Other Assets	502.1 KB	502.1 KB	0 B (0.0%)

📦 Download Diff Report: web Bundle Diff

Generated by Rsdoctor GitHub Action