ci: add --check-cache to yarn install in CI workflows

[dev-hari-prasad]

Part of #10363 (Item 6 from the tracking table).

As Dave noted in the issue discussion, yarn install --check-cache is a stronger form of cache and lockfile verification in CI.

Instead of just checking that the lockfile is self-consistent and trusting whatever is already in the runner's disk cache, --check-cache tells Yarn to re-verify the cached archives against the registry checksums to catch any cache tampering or poisoned archives.

Changes

• Added --check-cache to yarn install across the 4 GitHub Actions workflows:
  • check-javascript-style.yml
  • run-javascript-tests.yml
  • run-feature-tests-epas.yml
  • run-feature-tests-pg.yml

Summary by CodeRabbit

• Chores
  • Updated automated JavaScript checks and feature-test workflows to validate the Yarn cache during dependency installation.
  • Workflows now fail when cached dependencies are incomplete, stale, or corrupted.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: 7d22d100-3914-4352-b21d-c7e7d559217e

📥 Commits

Reviewing files that changed from the base of the PR and between bd7cde5 and 7654842.

📒 Files selected for processing (4)

• .github/workflows/check-javascript-style.yml
• .github/workflows/run-feature-tests-epas.yml
• .github/workflows/run-feature-tests-pg.yml
• .github/workflows/run-javascript-tests.yml

Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review.

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Walkthrough

Four GitHub Actions workflows now run yarn install --check-cache to verify cached dependencies during JavaScript setup.

Changes

Workflow cache integrity

Layer / File(s)	Summary
Yarn cache verification .github/workflows/check-javascript-style.yml, .github/workflows/run-feature-tests-epas.yml, .github/workflows/run-feature-tests-pg.yml, .github/workflows/run-javascript-tests.yml	The workflows now use yarn install --check-cache during JavaScript dependency installation.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 76548

CI now validates cached JavaScript dependencies during installs in the style, JavaScript test, and feature-test workflows, failing on corrupted or inconsistent cache entries. No current merge-blocking risk is identified.

Suggested reviewers: dpage

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding --check-cache to yarn install in CI workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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