Filtering local zones during VPC setup

[gjmveloso]

What does this PR do?

I tried to run the Terraform bootstrap in us-west-2 where I previously have the Los Angeles local zones enabled and received the following error during terraform apply:

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.

Reviewing the VPC module code I found we're not filtering local zones AZs which would make the code to break as NAT Gateways are not supported in all local zones at this time and we're using single_nat_gateway = true as well.

Motivation

Keeping the Terraform bootstrap code to work as is, regardless of the eventual opted-in local zones.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)

• Yes, I have added a new example under examples to support my PR

• Yes, I have updated the docs for this feature

• Yes, I have linked to an issue or feature request (applicable to PRs that solves a bug or a feature request). Fix [Bug]: Terraform bootstrap fails if local zones are enabled #210

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Additional Notes