Support API GatewayAPI in helm chart

Summary

GatewayAPI has reached v1 maturity, and is slowly being rolled out to cloud providers and CNIs (https://gateway-api.sigs.k8s.io/), currently the Gitlab helm chart does not support the GatewayAPI. GatewayAPI is the planned replacement for Ingress so being able to test a gitlab deployvia the chart would be helpful.

Desired behavior

Minimally: support httproute in place of ingress Potential: tcproute/tlsroute for other components

Versions

• Chart: 7.11.2
• Platform:
• Kubernetes: (kubectl version)
  • Client: 1.29
  • Server: 1.29

Acceptance Criteria

• Support minimal necessary configuration for Gateway API
• Smoke tests pass against environment
• Gateway API support is labeled experimental or beta
• Atleast one CI review environment uses Gateway API
• Follow ups issues created for:
  • Fixing issues found in full QA suite (if any)
  • (zero downtime) upgrade testing
  • Geo testing (with unified URLs)