feat: feature and tenancy tables

[Piotr1215]

Content Description

Shows users at a glance which features are available in OSS vs Enterprise, directly in the documentation page.

• Automatically adds Feature Availability tables to documentation pages based on features.yaml definitions
• Keeps tables in sync when features are added, removed, or their URLs change
• Enforces consistency via CI validation - PRs fail if tables are out of sync with features.yaml

# Sync all FeatureTables with current features.yaml
npm run sync-feature-tables

# Check if tables are in sync (runs in CI)
npm run validate-feature-tables

Preview Link

• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/introduction/oss-vs-free
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/deploy/control-plane/binary/high-availability
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/deploy/control-plane/binary/security/air-gapped
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/deploy/worker-nodes/private-nodes/security/air-gapped
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/deploy/worker-nodes/private-nodes/auto-nodes/quick-start-templates
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/configure/vcluster-yaml/integrations/cert-manager
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/configure/vcluster-yaml/integrations/eso
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/configure/vcluster-yaml/integrations/istio
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/configure/vcluster-yaml/integrations/kubeVirt
• https://deploy-preview-1416--next-vcluster-docs-site.netlify.app/docs/vcluster/next/configure/vcluster-yaml/integrations/netris

Internal Reference

Closes DOC-1040

@netlify /docs

[netlify]

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[vaidaslamanauskas]

4a4e187 Updated FeatureTable styling to match our visual language a little better. Fixed couple rendering issues, so table should look consistent between browsers.

I did not like how much space Feature availability heading takes up so made some changes. Not entirely happy yet, might need another pass.