feat(opensearch): support OpenSearch version 2.15

[mazyu36]

Issue # (if applicable)

N/A

Reason for this change

Amazon OpenSearch Service supports OpenSearch version 2.15.

Ref: https://aws.amazon.com/about-aws/whats-new/2024/09/amazon-opensearch-service-version-2-15/

% aws opensearch list-versions --region us-east-1

{
    "Versions": [
        "OpenSearch_2.15",
        "OpenSearch_2.13",
        "OpenSearch_2.11",
// omit

Description of changes

Add ver 2.15 enum

Description of how you validated changes

Add unit test and 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]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed add Clarification Request to a comment.

[mazyu36]

I have modified to be able to test multiple versions.
It tests the existing version 2.13 and the newly added version 2.15.

I considered adding all versions as well, but I thought that might be overkill, so I haven't.

[mazyu36]

Exemption Request: As this only involves adding an enum for versions, I think that modifying the README was unnecessary.

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

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b34c963
• Result: SUCCEEDED
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