feat(batch): ec2 Managed Compute Environment support default instance classes, deprecate useOptimalInstanceClasses

[phuhung273]

Issue # (if applicable)

Closes #35515

Reason for this change

• https://aws.amazon.com/blogs/hpc/introducing-default-instance-categories-for-aws-batch/
• optimal behaviour change in early November 2025

Description of changes

• EC2 Managed Compute Environment support default instance classes
• Deprecate useOptimalInstanceClasses

Description of how you validated changes

Unit + Integ

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

[Abogical]

Thank you!

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[Abogical]

@Mergifyio update

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update

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[Abogical]

@Mergifyio rebase

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rebase

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[mergify]

This pull request has been removed from the queue for the following reason: pull request branch update failed.

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You should update or rebase your pull request manually. If you do, this pull request will automatically be requeued once the queue conditions match again.
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