[EKS] [Node Group]: Give EC2 instances a Name tag

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**Tell us about your request**
Add Name tag to EKS nodegroup instances, based on the node group name.

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

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Give EKS EC2 node group instances a Name to make them easier to identify, similar to ECS instances.

**Are you currently working around this issue?**
Manually adding Name tag.

No source files, tests, or implementation entry points are identified in the issue. Start by reviewing the EKS node-group instance tagging path and related ECS tagging behavior, then confirm the expected AWS ownership and validation approach. Done means EKS node-group EC2 instances receive a Name tag derived from the node group name.

Written by the indexing model from the issue text.