fixup! Migrate cluster modules from map(map(string)) to map(object)

Author: pst

google/cluster/variables.tf

@@ -81,17 +81,6 @@ variable "configuration" {
   }))
 
   description = "Map with per workspace cluster configuration."
-
-  validation {
-    condition = terraform.workspace == var.configuration_base_key && (
-      var.configuration["name_prefix"] == null ||
-      var.configuration["base_domain"] == null ||
-      var.configuration["project_id"] == null ||
-      var.configuration["region"] == null ||
-      var.configuration["cluster_min_master_version"] == null
-    )
-    error_message = "Missing one or more required attributes for ${var.configuration_base_key} env: name_prefix, base_domain, project_id, region, cluster_min_master_version"
-  }
 }
 
 variable "configuration_base_key" {