[EKS] [request]: Schedule Autoscaling for EKS Managed Node Group

### Community Note

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**Tell us about your request**
What do you want us to build?
- EKS Managed Node Group should support Scheduled scaling for Amazon EC2 Auto Scaling
- https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-scheduled-scaling.html
**Which service(s) is this request for?**
This could be 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?
n/a

**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.)

The request concerns scheduled scaling for EKS Managed Node Groups and links the Amazon EC2 Auto Scaling scheduled-scaling documentation. Start by reading that documentation and comparing it with the current EKS service capabilities; no repository files, tests, or implementation entry points are identified. Done would mean the requested scheduled-scaling support is defined and implemented with validation, but the issue does not specify those details.

Written by the indexing model from the issue text.