chore: optimize CI pnpm setup

[chenjiahan]

Summary

This PR aligns the GitHub Actions pnpm setup with the current Rsbuild workflow pattern from web-infra-dev/rsbuild#7856.

• Replace corepack/manual pnpm install steps with pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 and run_install: true.
• Explicitly disable actions/setup-node package manager caching with package-manager-cache: false.
• Keep browser installation commands as separate post-install steps where needed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 3bce5eed-c321-4694-b3a4-75069f47e17a

📥 Commits

Reviewing files that changed from the base of the PR and between fd5df45 and a17b3e4.

📒 Files selected for processing (2)

• .github/workflows/release.yml
• .github/workflows/test.yml

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📝 Walkthrough

Walkthrough

This PR consolidates the pnpm dependency setup across two GitHub workflows. The release and test workflows previously used inline corepack commands to enable pnpm followed by manual pnpm install. Both workflows now consistently use actions/setup-node (with package-manager-cache disabled) paired with the dedicated pnpm/action-setup action configured with run_install: true. The build and test execution steps remain unchanged.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: optimizing the CI pnpm setup process by updating GitHub Actions workflows.
Description check	✅ Passed	The description is directly related to the changeset, detailing the specific workflow updates to pnpm setup configuration and rationale for alignment with rsbuild patterns.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/optimize-ci-pnpm-action-20260609

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