Update TopologyAwareHints featuregate to TopologyAwareRouting

[rajnkamr]

From Kubernetes 1.27, Topology Aware Hints k8 feature is renamed to Topology Aware Routing.
Update the same across Antrea to adopt the k8s nomenclature.

As we know Topology Aware Routing formerly aka Topology Aware Hints adjusts routing behavior to prefer keeping traffic in the zone it originated from. In some cases this can help reduce costs or improve network performance.

[tnqn]

I don't find such renaming in K8s features, which also doesn't make sense as it would break compatibility. Some code description already uses "Topology Aware Routing".

[rajnkamr]

Description update in doc could also help, https://kubernetes.io/docs/concepts/services-networking/topology-aware-routing/