test(e2e): add GCP dynamic host catalog e2e tests (#5294)

* test(e2e): add GCP infra resources and tests for enos testing

- add 1 new `gcp_target` module that creates a GCP VM instance with labels for filtering
- add GCP dynamic host catalog e2e tests

enos/enos-modules.hcl

@@ -178,3 +178,15 @@ module "docker_ldap" {
 module "docker_minio" {
   source = "./modules/docker_minio"
 }
+
+module "gcp_iam_setup" {
+  source         = "./modules/gcp_iam_setup"
+  gcp_project_id = var.gcp_project_id
+}
+
+module "gcp_target" {
+  source       = "./modules/gcp_target"
+  target_count = var.target_count
+  environment  = var.environment
+  enos_user    = var.enos_user
+}