[EKS][Fargate][Container Insights]: Include `pod_number_of_container_restarts` in the metrics

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**Tell us about your request**
Include `pod_number_of_container_restarts` in the container insight metrics.

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

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
I want to create alarms when a pod restarts.

The issue names no files, tests, or implementation entry points; start by determining where EKS/Fargate Container Insights metrics are defined and whether this roadmap repository tracks implementation work. Done means `pod_number_of_container_restarts` is included in the container insight metrics and can support alarms when a pod restarts.

Written by the indexing model from the issue text.