chore(gateway_api_crd): default Gateway API CRDs to v1.5.1

Bump the gateway_api_crd module default from Gateway API v1.4.1 to
v1.5.1 (channel stays experimental, install still uses
kubectl apply --server-side). Extends the version enum with
v1.5.1 and v1.5.0 while retaining the existing v1.4.x/v1.3.0/v1.2.0
entries.

This is the prerequisite CRD bump for the companion NGINX Gateway
Fabric 2.6.3 upgrade, since NGF 2.5.0+ requires Gateway API v1.5.x.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 2 people

modules/gateway_api_crd/k8s/1.0/facets.yaml

@@ -33,9 +33,11 @@ spec:
         - experimental
     version:
       type: string
-      default: v1.4.1
+      default: v1.5.1
       description: Gateway API version to install
       enum:
+        - v1.5.1
+        - v1.5.0
         - v1.4.1
         - v1.4.0
         - v1.3.0
@@ -47,4 +49,4 @@ sample:
   disabled: true
   spec:
     channel: experimental
-    version: v1.4.1
+    version: v1.5.1

modules/gateway_api_crd/k8s/1.0/main.tf

@@ -1,7 +1,7 @@
 locals {
   name      = lower(var.environment.namespace == "default" ? var.instance_name : "${var.environment.namespace}-${var.instance_name}")
   namespace = var.environment.namespace
-  version   = lookup(var.instance.spec, "version", "v1.4.1")
+  version   = lookup(var.instance.spec, "version", "v1.5.1")
   channel   = lookup(var.instance.spec, "channel", "experimental")
 
   # Build the install URL based on version and channel