Supports gateway-api 1.6.0

[nic-6443]

• Supports gateway-api 1.6.0 https://github.com/kubernetes-sigs/gateway-api/releases#release-v1.6.0
• Submit the compatibility test report and ensure that the APISIX Ingress Controller and API7 Ingress Controller appear on the Gateway API website.
  • https://gateway-api.sigs.k8s.io/docs/implementations/versions/v1.5/
  • https://gateway-api.sigs.k8s.io/docs/implementations/versions/v1.4/
  • https://gateway-api.sigs.k8s.io/docs/implementations/versions/v1.3/

[coderabbitai]

🔗 Related PRs

#418 - fix: update observedGeneration on Gateway-API route status conditions (apache/apisix-ingress-controller#2768) [merged]
#424 - feat: support downstream mTLS via Gateway API frontendValidation [merged]

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