feat(amplify): support build compute type

[mazyu36]

Issue # (if applicable)

N/A

Reason for this change

Amplify supports customizable build instances, but L2 Construct does not support it.
https://aws.amazon.com/about-aws/whats-new/2025/05/aws-amplify-hosting-customizable-build-instances/

Description of changes

Add buildComputeType property.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Add unit tests and an integ test.

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

[aws-cdk-automation]

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1bfadd1
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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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).

[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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