docs(generic): sync template standards updates

[mberlofa]

Summary

• document Generic ingress class behavior and networkPolicy.extraEgress
• add Generic to the playground registry with curated defaults
• sync the configuration reference for the new NetworkPolicy value

Validation

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

Charts PR: helmforgedev/charts#667
Issue: helmforgedev/charts#633

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new generic chart configuration entry to the playground config data with workload, ingress, resources, and network policy field groups; registers generic in the playground page's sync config list; and updates the generic chart documentation table formatting and an ingressClassName description.

Changes

Generic Chart Playground Support

Layer / File(s)	Summary
Generic chart playground field definitions src/data/playground-configs.ts	Adds a generic chart config with workload, ingress (gated by ingress.enabled), resource request/limit, and network policy (gated by networkPolicy.enabled) field groups.
Enable generic chart in playground page src/pages/playground.astro	Registers generic in siteSyncPlaygroundConfigs, allowing it to appear in the playground regardless of maturity.
Generic chart docs updates src/pages/docs/charts/generic.mdx	Clarifies that an empty ingress.ingressClassName omits spec.ingressClassName and reflows the Security and Storage parameters table.

Estimated code review effort: 2 (Simple) | ~10 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 relevant to the Generic docs sync, though it is a bit broad about the exact changes.
Description check	✅ Passed	The description includes a clear summary, validation steps, and issue references, with no blog section needed for these files.

✨ 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/generic-template-standards-sync

---

_{Comment @coderabbitai help to get the list of available commands.}