[EKS] [request]: Be able to config zipkin address in Advance configuration of solo-io_istio-distro addon

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**Tell us about your request**
I have deployed solo-io_istio-distro via EKS addon. I want to collector Istio tracing data by ADOT. But I am not able to configure the zipkin address in istio-system/istio configmap by EKS addon advance configuration. Since this parameter is not available in the schema.

Below is the config item to be updated in istio-system/istio configmap.

`data.defaultConfig.tracing.zipkin.address`

```
apiVersion: v1
data:
mesh: |-
defaultConfig:
discoveryAddress: istiod.istio-system.svc:15012
proxyMetadata:
ISTIO_META_ENABLE_HBONE: "true"
tracing:
zipkin:
address: zipkin-collector.adot-collector:9411
```

**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?**
Be able to configure zipkin address in EKS addon advance configuration. Otherwise I have to update the configmap directly. This can be overwritten if I upgrade my addon next time.

**Are you currently working around this issue?**
I updated the istio-system/istio configmap inside the Kubernetes cluster directly.

**Additional context**
No

**Attachments**
No

Start by tracing the EKS addon advanced-configuration schema for solo-io_istio-distro and the generated istio-system/istio ConfigMap. Verify how data.defaultConfig.tracing.zipkin.address is represented and persisted across addon upgrades; done means the schema accepts this address and applies it without direct ConfigMap edits.

Written by the indexing model from the issue text.