feat(ec2): add g6 instance

[mellevanderlinde]

Issue # (if applicable)

Closes #30683

Reason for this change

G6 instances are not yet supported by CDK L2

Description of changes

Added G6 instance class

Description of how you validated changes

Added g6 to existing unit test

Checklist

• [x] 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

[mellevanderlinde]

Would this small change qualify for an "Exemption Request"? An integration test might not be required for adding an instance class

[msambol]

Would this small change qualify for an "Exemption Request"? An integration test might not be required for adding an instance class

Yeah, no integration test is needed here.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: d793ce54036cdaec0beddb6949c9f4fd702ebda9
• Result: SUCCEEDED
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