chore(ec2): add M7gd, R7gd, C7gd instance types

[funguy-tech]

As of v2.92.0, we don't yet have C7gd, M7gd, and R7gd instance types available via instance type selection.

Closes #26774

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[funguy-tech]

Clarification Request. Current documentation / integration tests do not seem to specifically test the 'd' subfamily of instance types. A codebase search for '6gd' shows only documentation related to ElasticSearch and ElastiCache, which should be updated when the respective services update to support this instance type instead of when the instance types become selectable for general EC2 provisioning. It is unclear where a README or which Integration Tests would be updated to reflect availability of these new instance types.

Should this be categorized as something other than feat, or just subject to a manual review to bypass the automated PR checks since they do not seem to apply fully here?

Modeled after #12301

[colifran]

@funguy-tech Thanks for working on this. I updated the title to be a chore. I found a similar PR (#24450) that we can model this after. That said, we don't need an integ test or a README update for this.

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

[colifran]

@funguy-tech Looks good. Thanks for adding these!

[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).

[aws-cdk-automation]

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