fix: Failed to create NAT gateway for eks-cluster-with-new-vpc example if local zones are enabled

[aaroniscode]

What does this PR do?

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Motivation

Followed the getting started documentation with the eks-cluster-with-new-vpc example and the step

terraform apply -target="module.vpc"

failed with the error

│ Error: error creating EC2 NAT Gateway: NotAvailableInZone: Nat Gateway is not available in this availability zone
│ 	status code: 400, request id: 522ca79d-4c64-4b62-8be9-66b4d5b91014
│
│   with module.vpc.aws_nat_gateway.this[0],
│   on .terraform/modules/vpc/main.tf line 1025, in resource "aws_nat_gateway" "this":
│ 1025: resource "aws_nat_gateway" "this" {
│

Upon investigation, Terraform had selected the Phoenix Local zone to create one of the subnets and then tried to create the NAT gateway in the local zone.

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 created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs require a new example and/or doc page. In general:

• Use an existing example when possible to demonstrate a new addons usage
• A new docs page under docs/add-ons/* is required for new a new addon

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

I followed the instructions in the Terraform docs to filter only availability zones.

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/availability_zones#by-filter

Only Availability Zones (no Local Zones):

data "aws_availability_zones" "example" {
  filter {
    name   = "opt-in-status"
    values = ["opt-in-not-required"]
  }
}

[Zvikan]

LGTM, thank you!