feat(ec2): support of m7i and m7i-flex ec2-instancetypes

[xXPOLYGONXx]

Support of M7i and M7i-flex EC2-Instancetypes.
They were introduced here and are also integrated in AWS-Cloudformation

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[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.

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[xXPOLYGONXx]

Exemption Request

This PR is similar to this, which didnt need changes to readme and tests.

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

[scanlonp]

Lets rearrange the order of the enum to be consistent with its current order. Put the instance types that are written in words right above their corresponding abbreviation.

Otherwise looks good. Thanks for this addition!

Pull request has been modified.

[xXPOLYGONXx]

Thanks for the exemption.
I applied your suggestion to the newest commit.

Pull request has been modified.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: f51dc45
• Result: SUCCEEDED
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