[EKS] [TAG]: Cross-Account Control Plane ENI should be tagged

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**Tell us about your request**
What do you want us to build?

Cross-Account Control Plane ENI should be tagged with cluster name at-least

**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?**
What outcome are you trying to achieve, ultimately, and why is it hard/impossible to do right now? What is the impact of not having this problem solved? The more details you can provide, the better we'll be able to understand and solve the problem.

**Are you currently working around this issue?**
How are you currently solving this problem?

**Additional context**
Anything else we should know?

**Attachments**
If you think you might have additional information that you'd like to include via an attachment, please do - we'll take a look. (Remember to remove any personally-identifiable information.)

Start by confirming how EKS creates cross-account control-plane ENIs and what tagging support is available. No repository files, entry points, or tests are named, so the implementation location and validation approach must be established first. Done means the ENI is tagged with the cluster name and the behavior is documented or tested.

Written by the indexing model from the issue text.