feat: port custom hooks to NGF 2.4.1 chart

[unni-facets]

Summary

• Port custom hooks (wait-for-lb, cleanup) and certs-job annotation fixes from the 2.3.0 chart into the 2.4.1 nginx-gateway-fabric Helm chart
• Add waitForLoadBalancer values to prevent Route53 ARRDATAIllegalIPv4Address errors on first deploy
• Update facets.yaml, main.tf, and outputs.tf for the nginx_gateway_fabric_legacy module

Test plan

• Deploy to a test environment and verify the LB wait hook runs before Route53 registration
• Verify cleanup hook fires on uninstall
• Confirm certs-job completes without annotation errors

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/ngf-241-chart-hooks

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