fix(ec2): allow NAT instance to associate public IP #31812
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Issue # (if applicable)
Closes #31711
Reason for this change
When we set mapPublicIpOnLaunch=false for public subnets, NAT instances does not get public IP addresses assigned, resulting in non-working NAT instances.
Disabling mapPublicIpOnLaunch is recommended as AWS Config rule (and cdk-nag as well.)
https://docs.aws.amazon.com/config/latest/developerguide/subnet-auto-assign-public-ip-disabled.html
Description of changes
Support
associatePublicIpAddressDescription of how you validated changes
New unit and integ tests.
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license