docs(drupal): sync playground coverage

[mberlofa]

Summary

• add drupal to the playground coverage allowlist required by the chart site-sync gate

Validation

• make site-sync-check CHART=drupal
• npm run lint
• npm run format:check
• npm run build
• make release-check REPO=site
• make attribution-check REPO=site

Chart PR: helmforgedev/charts#662
Issue: helmforgedev/charts#633

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a drupal entry to the siteSyncPlaygroundConfigs slug map in src/pages/playground.astro, mapping it to src/data/playground-configs.ts to include it in playback/config synchronization logic.

Changes

Playground Config Sync

Layer / File(s)	Summary
Add drupal slug mapping src/pages/playground.astro	Adds a drupal entry to siteSyncPlaygroundConfigs, mapping it to src/data/playground-configs.ts.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title is concise and accurately reflects adding Drupal to playground coverage sync.
Description check	✅ Passed	The description covers the change summary and validation steps, and is mostly aligned with the template.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/drupal-template-standards-sync

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