Feature request: Add support for multiple Gateways on HttpRoute (Kubernetes)

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On Integration of HTTPRoute Support in SonarQube Helm Chart, support for HttpRoute was added to Helm chart.

However, it currently supports reference to only 1 parentRef.

The Gateway API spec allows an HTTPRoute to declare multiple parentRefs, enabling a single route to be attached to more than one gateway simultaneously. This is a common pattern in enterprise environments where traffic is split between a public-facing and an internal gateway.

Current values schema:

httproute:
  enabled: true
  gateway: my-gateway
  gatewayNamespace: my-gateway-namespace

Proposed addition:

httproute:
  enabled: true
  parentRefs:
    - name: gateway-public
      namespace: gateway-api
    - name: gateway-internal
      namespace: gateway-api

This would be backwards-compatible — the existing gateway/gatewayNamespace shorthand could remain for single-gateway setups, while parentRefs unlocks multi-gateway attachment for those who need it. Alternatively, gateway/gatewayNamespace could be deprecated in favour of parentRefs entirely, aligning the chart values more closely with the Gateway API spec.

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