test: migrate some jest tests to rstest

[9aoy]

Summary

Migrate some jest tests to rstest, and use modern:source conditionName instead of jsnext:source when use modern.js package source code.

• <rootDir>/packages/cli/plugin-data-loader/
• <rootDir>/packages/cli/plugin-ssg/
• <rootDir>/packages/toolkit/plugin/
• <rootDir>/packages/toolkit/compiler/babel/
• <rootDir>/packages/toolkit/i18n-utils/
• <rootDir>/packages/server/babel-plugin-module-resolver/
• <rootDir>/packages/server/core/
• <rootDir>/packages/server/bff-runtime/
• <rootDir>/packages/generator/**

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 41986ac

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Rsdoctor Bundle Diff Analysis

📁 bundle-diff

Path: benchmark/bundle-diff/dist/rsdoctor-data.json

📌 Baseline Commit: e6568be9d4 | PR: #7933

Metric	Current	Baseline	Change
📊 Total Size	497.5 KB	497.5 KB	0 B (0.0%)
📄 JavaScript	487.6 KB	487.6 KB	0 B (0.0%)
🎨 CSS	1.2 KB	1.2 KB	0 B (0.0%)
🌐 HTML	5.9 KB	5.9 KB	0 B (0.0%)
📁 Other Assets	2.8 KB	2.8 KB	0 B (0.0%)

📦 Download Diff Report: bundle-diff Bundle Diff

Generated by Rsdoctor GitHub Action