docs(oauth2-proxy): sync template standards updates

[mberlofa]

Summary

• Document networkPolicy.extraEgress for OAuth2 Proxy.
• Add OAuth2 Proxy playground controls for custom egress CIDR and port.
• Correct the documented pinned image tag to v7.15.3.
• Register OAuth2 Proxy in the playground sync allowlist.

Related

• Syncs with fix(oauth2-proxy): align template standards charts#682.
• Issue: fix: align 81 charts with template standards charts#633.

Validation

• npm run lint
• npm run format:check
• npm run build
• make site-sync-check CHART=oauth2-proxy
• make release-check REPO=site
• make attribution-check REPO=site

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a Network Policy configuration group with extra egress CIDR and port fields to the oauth2-proxy playground chart config, updates related documentation (image version bump and new networkPolicy.extraEgress values), and adds oauth2-proxy to the playground sync allowlist.

Changes

oauth2-proxy Network Policy support

Layer / File(s)	Summary
Network Policy field group src/data/playground-configs.ts	Adds a collapsible Network Policy section gated by networkPolicy.enabled with new Extra Egress CIDR (default 10.80.0.0/16) and Extra Egress Port (default 443) fields.
Documentation updates src/pages/docs/charts/oauth2-proxy.mdx	Bumps the pinned upstream image tag from v7.15.2 to v7.15.3 and documents networkPolicy.extraEgress (default []) in the production values example and values table.
Playground allowlist src/pages/playground.astro	Adds oauth2-proxy to siteSyncPlaygroundConfigs, expanding the allowed chart slugs for playgroundCharts.

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 scoped to oauth2-proxy docs and broadly matches the sync/update theme, though it is somewhat generic.
Description check	✅ Passed	The description covers summary, related work, and validation steps, but it omits the template's Quality Gates checklist 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/oauth2-proxy-template-standards-sync

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