chore(ec2): add m8i, m8i-flex, r8i, r8i-flex instance class

[phuhung273]

Issue # (if applicable)

None

Reason for this change

https://aws.amazon.com/about-aws/whats-new/2025/08/amazon-ec2-m8i-and-m8i-flex-instances-generally-available/
https://aws.amazon.com/about-aws/whats-new/2025/08/memory-optimized-amazon-ec2-r8i-r8i-flex-instances/

Description of changes

Add m8i, m8i-flex, r8i, r8i-flex instance class

Description of how you validated changes

$ aws ec2 describe-instance-types | grep -e m8i -e r8i
            "InstanceType": "r8i.48xlarge",
            "InstanceType": "r8i-flex.8xlarge",
            "InstanceType": "m8i.16xlarge",
            "InstanceType": "m8i-flex.2xlarge",

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[phuhung273]

Thanks for your review @alvazjor, I believe the failing @aws-cdk/lazify is fixed thanks to #35380.

Pull request has been modified.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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