Plan fails if KMS key is being created at the same time as the module

[tomjjjj1]

Describe the bug

A re-opening of a previous ticket that has been closed #1278, we are hitting the exact same issue

To Reproduce

Steps to reproduce the behavior:
Try to use the module like this:

module "gitlab-runner" {
source = "cattle-ops/gitlab-runner/aws"
version = "9.2.0"

environment = "prod"
runner_gitlab = {
url = var.gitlab_url
preregistered_runner_token_ssm_parameter_name = var.token_ssm_parameter_name
}

enable_managed_kms_key = true

subnet_id = var.subnet
vpc_id = var.vpc
}

Expected behavior

Terraform plan should not fail

Additional context

Caused by #1258

[tomjjjj1]

Relates to #1278

[tomjjjj1]

Fix MR raised as #1286