[EKS] [eks-node-monitoring-agent] [request]: support hostnetwork configuration

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**Tell us about your request**

Unless there is a reason that this has to run in the hostnetwork, it would be great if there was an option to make that configurable in the addon.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**

We're using cilium in overlay mode and prefer to run things with `hostnetwork: false` when possible.

Start by investigating the EKS eks-node-monitoring-agent addon and how its hostnetwork setting is currently defined. Review the interaction with Cilium overlay mode, then determine the configuration surface and compatibility constraints. Done means hostnetwork can be set to false without breaking the agent or its supported EKS behavior.

Written by the indexing model from the issue text.