feat(ec2): add NAT instance V2 support using AL2023 (aws#29013)

### Issue # (if applicable)

Closes aws#28907

### Reason for this change

Current NAT instance image has reached EOL on Dec 31 2023.

### Description of changes

If NAT instances are a better match for your use case than NAT gateways, you can create your own NAT AMI from a current version of Amazon Linux as described in [Create a NAT AMI](https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#create-nat-ami).

### Description of how you validated changes

New unit and integration tests

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*