fix(opensearchservice): added i4i instances to the list of EBS options

[khushail]

Issue # (if applicable)

Closes #32070 .

Reason for this change

Getting an error while using i4i instances. Since i4g was added, it makes sense to include i4i as well se those are supported.

Description of changes

refer to changed set of files

Description of how you validated changes

added unit and integ tests

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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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e4c2f36
• Result: FAILED
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