[PR] fix(apisix): render externalTrafficPolicy for ClusterIP with externalIPs [apisix-helm-chart]

["AGheller (via GitHub)" <gi...@apache.org>]

AGheller opened a new pull request, #1020:
URL: https://github.com/apache/apisix-helm-chart/pull/1020

   Fixes #1019
   
   ### What
   
   #950 restricted `externalTrafficPolicy` in the gateway Service to `LoadBalancer` and `NodePort`, to fix #755 (the API server rejects the field on a plain ClusterIP Service). Kubernetes also accepts it on a `ClusterIP` Service with `externalIPs`, where kube-proxy honors it, and setting it to `Local` is the way to preserve the client source IP in that setup. Since 2.18.0 the field is silently dropped there and the Service falls back to `Cluster`.
   
   This PR also renders the field when `service.externalIPs` is set.
   
   ### Rendering (`helm template --show-only templates/service-gateway.yaml`)
   
   | Values | Before | After |
   |---|---|---|
   | `type=ClusterIP`, `externalIPs={1.2.3.4}`, `externalTrafficPolicy=Local` | field omitted | `externalTrafficPolicy: Local` |
   | `type=ClusterIP`, no `externalIPs` | field omitted | field omitted (#755 fix kept) |
   | `type=NodePort`, `externalTrafficPolicy=Local` | `Local` | `Local` |
   | defaults | omitted | omitted |
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)
   


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