docs(discount-bandit): sync network policy coverage

[mberlofa]

Summary

• add Discount Bandit to the playground chart registry
• document the canonical networkPolicy.egress.extraEgress value in the chart page configuration reference

Validation

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

Chart PR: helmforgedev/charts#658
Issue: helmforgedev/charts#633

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR expands the Networking configuration reference table in the discount-bandit chart documentation to cover additional NetworkPolicy ingress and egress parameters, and adds a 'discount-bandit' entry to the site-sync playground configs allowlist.

Changes

Discount Bandit Docs and Playground Update

Layer / File(s)	Summary
Networking docs and playground allowlist update src/pages/docs/charts/discount-bandit.mdx, src/pages/playground.astro	The Networking table now documents additional networkPolicy.ingress.* and networkPolicy.egress.* parameters, and discount-bandit is added to siteSyncPlaygroundConfigs.

Estimated code review effort: 1 (Trivial) | ~5 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 clearly matches the docs-focused Discount Bandit changes, including network policy documentation updates.
Description check	✅ Passed	The description covers the summary and validation steps, but it does not follow the template headings exactly and omits a Related Issue section.

✨ 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/discount-bandit-template-standards-sync

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