charts/gateway: allow "enabled" field in the schema (#58278)

* charts/gateway: allow "enabled" field in the schema

* add release notes

Author: tomasz-sodzawiczny

manifests/charts/gateway/values.schema.json

@@ -11,6 +11,10 @@
         "global": {
           "type": "object"
         },
+        "enabled": {
+          "description": "Field used as a condition when this chart is included as a dependency. It's allowed in the schema, but the chart itself does not read it. For more information see: https://helm.sh/docs/chart_best_practices/dependencies/#conditions-and-tags.",
+          "type": "boolean"
+        },
         "affinity": {
           "type": "object"
         },

releasenotes/notes/helm-values-shema-enabled-field.yaml

@@ -0,0 +1,9 @@
+apiVersion: release-notes/v2
+
+kind: bug-fix
+area: installation
+issue:
+  - 58277
+releaseNotes:
+- |
+  **Fixed** `istio-gateway` helm chart values schema to allow top-level `enabled` field.