[Testing rewrite] Cloud Wan example fails

While re-writing from terratest to terraform test, Cloud WAN is failing. Test rewrite info can be found here: https://github.com/aws-ia/terraform-aws-vpc/pull/127

│ Error: creating Network Manager VPC (arn:aws:ec2:eu-west-1:<>:vpc/vpc-09cd420afda9e9e9b) Attachment (core-network-03413d810dfe4a70d): ValidationException: Core network state is invalid. core network id: core-network-03413d810dfe4a70d
│ {
│   RespMetadata: {
│     StatusCode: 400,
│     RequestID: "98c0f702-d9c5-4d37-bb1a-06d6132c101e"
│   },
│   Message_: "Core network state is invalid. core network id: core-network-03413d810dfe4a70d",
│   Reason: "Other"
│ }
│ 
│   with module.ireland_vpc.aws_networkmanager_vpc_attachment.cwan[0],
│   on .terraform/modules/test.tests.examples_cloud_wan.validate.ireland_vpc/main.tf line 472, in resource "aws_networkmanager_vpc_attachment" "cwan":
│  472: resource "aws_networkmanager_vpc_attachment" "cwan" {
│ 
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│ Error: creating Network Manager VPC (arn:aws:ec2:us-east-1:<>:vpc/vpc-0488572a93a0c78bc) Attachment (core-network-03413d810dfe4a70d): ValidationException: Core network state is invalid. core network id: core-network-03413d810dfe4a70d
│ {
│   RespMetadata: {
│     StatusCode: 400,
│     RequestID: "d7c93484-7e65-408a-99d6-a8b408c2a85f"
│   },
│   Message_: "Core network state is invalid. core network id: core-network-03413d810dfe4a70d",
│   Reason: "Other"
│ }
│ 
│   with module.nvirginia_vpc.aws_networkmanager_vpc_attachment.cwan[0],
│   on .terraform/modules/test.tests.examples_cloud_wan.validate.nvirginia_vpc/main.tf line 472, in resource "aws_networkmanager_vpc_attachment" "cwan":
│  472: resource "aws_networkmanager_vpc_attachment" "cwan" {

aws-ia / terraform-aws-vpc

[Testing rewrite] Cloud Wan example fails #132