[Bug]: Terraform bootstrap fails if local zones are enabled

[gjmveloso]

Welcome to AWS Blueprints for Crossplane!

• Yes, I've searched similar issues on GitHub and didn't find any.

AWS Blueprints for Crossplane Release version

latest

What is your environment, configuration and the example used?

https://github.com/awslabs/crossplane-on-eks/blob/main/bootstrap/terraform/README.md#step4-finally-terraform-apply

What did you do and What did you see instead?

Consistently receiving the following error:

Error: creating EC2 NAT Gateway: operation error EC2: CreateNatGateway, https response error StatusCode: 400, RequestID: 30d3fb07-1962-493b-a53e-fe93219bc456, api error OperationNotPermitted: Primary elastic IP and subnet belong in different network border groups.

Additional Information

My hypothesis is that as NAT Gateways are not supported across all local zones, in this case within `us-west-2`, and we're using `single_nat_gateway` the VPC module does not handle that properly.

Suggest to filter out local zones AZs.