chore(ci): remove redundant Rstest Playwright setup

[chenjiahan]

Important

The --with-deps experiment failed after this PR was merged. rspack (rstest) showed that ubuntu-latest lacks required WebKit libraries. Follow-up #82 restores --with-deps.

Summary

• remove redundant Playwright Chromium installs from the Rsbuild/Rstest, Rslib/Rstest, and Rstest examples suites
• use the Chrome channel provided by the GitHub Actions runner for Chromium coverage
• reduce the Rspack/Rstest install from Chromium + WebKit to WebKit only

Why

Rstest selects the system Chrome channel in CI, and rstack-examples does the same after rstackjs/rstack-examples#486. This follows the cleanup in web-infra-dev/rslib#1531.

Rspack's Rstest suite still explicitly covers WebKit, so that browser must continue to be installed.

--with-deps CI experiment

This PR intentionally removed --with-deps. The long-running rspack (rstest) job reached browser-mode/webkit.test.ts after merge, then failed because ubuntu-latest was missing libgtk-4.so.1, libgraphene-1.0.so.0, libevent-2.1.so.7, Opus, and several GStreamer libraries.

The result proves WebKit still requires --with-deps; #82 restores it without reverting the safe Chromium cleanup.

Validation

• pnpm lint
• git diff --check
• rsbuild (rstest), rslib (rstest), and rstest (examples) passed without installing Chromium
• Rstest examples passed locally with GITHUB_ACTIONS=true, including all three browser-mode examples

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 4b0ec85 and b5ebedc.

📒 Files selected for processing (4)

• tests/rsbuild/rstest.ts
• tests/rslib/rstest.ts
• tests/rspack/rstest.ts
• tests/rstest/examples.ts

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📝 Walkthrough

Walkthrough

The test configurations remove unused $ imports and beforeTest hooks that installed Playwright Chromium dependencies. The Rspack configuration now installs only Playwright WebKit and documents that Chromium is provided by GitHub’s Chrome environment.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/remove-rstest-playwright-setup

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[chatgpt-codex-connector]

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Reviewed commit: b5ebedc4d2

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[chatgpt-codex-connector]

Keep Chromium installation for non-GitHub runs

When this suite is run locally via pnpm test --stack rspack rstest, GITHUB_ACTIONS is absent, so Rstest does not select the GitHub runner's system Chrome; this hook now downloads only WebKit even though the e2e suite still covers Chromium, leaving Playwright without a Chromium executable on a clean checkout. Preserve the Chromium install outside GitHub Actions (and likewise in the other changed Rstest suites) while skipping it only when the system Chrome channel is actually selected.

AGENTS.md reference: AGENTS.md:L7-L9

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