chore(ec2): add VPC interface endpoints for Cognito

[mazyu36]

Add new VPC inteface endpoints.

Ref: Amazon Cognito user pools now supports private connectivity with AWS PrivateLink

$ aws ec2 describe-vpc-endpoint-services --filters "Name=service-name,Values=*cognito*" --region us-east-1 --query "ServiceNames[]"

[
    "com.amazonaws.us-east-1.cognito-idp",
    "com.amazonaws.us-east-1.cognito-idp-fips"
]

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

[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).

[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).

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