[Feature Request]: Move Demo access from `aws-auth` ConfigMap to EKS Access entries

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/EnAccess/micropowermanager/blob/main/CONTRIBUTING.md) for this project, if it exists.
- [x] I agree to follow the [Code of Conduct](https://github.com/EnAccess/micropowermanager/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://github.com/EnAccess/micropowermanager/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

Currently we are using `aws-auth` ConfigMap to grant users access to EKS cluster in the AWS example.

However, this is deprecated, see https://docs.aws.amazon.com/eks/latest/userguide/auth-configmap.html

Please change to use the recommended way of using Access entries: https://docs.aws.amazon.com/eks/latest/userguide/access-entries.html

### Proposed Solution

See above

### Alternatives Considered

See above

### Additional Information

_No response_