aws-eks: `addAutoScalingGroupCapacity` lacks support for Amazon Linux 2023

### Describe the feature

`addAutoScalingGroupCapacity` allows the user to select a MachineImageType, but this only includes AL2 or Bottlerocket. AL2023 is missing.

https://github.com/aws/aws-cdk/blob/v2.139.0/packages/aws-cdk-lib/aws-eks/lib/cluster.ts#L2468-L2480

### Use Case

I want to use a newer kernel than is available in AL2 on my EKS ASGs.

### Proposed Solution

_No response_

### Other Information

AL2023 support has been added for managed node groups but not for ASGs. See #29546 #29334. cc @pahud as you've handled those issues.

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.139.0

### Environment details (OS name and version, etc.)

N/A

Start in packages/aws-cdk-lib/aws-eks/lib/cluster.ts around lines 2468-2480, where addAutoScalingGroupCapacity selects the MachineImageType. Compare the existing AL2 and Bottlerocket handling with the AL2023 support referenced in issues #29546 and #29334. Done means ASGs can select Amazon Linux 2023 through this API, with the relevant behavior covered by the repository's existing checks.

Written by the indexing model from the issue text.