fix: Remove kubernetes_cluster_issuer_url variable and determine from cluster module

Author: KyleGoyette

main.tf

@@ -328,7 +328,7 @@ module "wandb" {
         internalJWTMap = [
           {
             "subject" = "system:serviceaccount:default:${local.weave_trace_sa_name}",
-            "issuer"  = var.kubernetes_cluster_oidc_issuer_url
+            "issuer"  = module.eks.cluster.oidc_issuer_url
           }
         ]
       }

variables.tf

@@ -522,13 +522,3 @@ variable "clickhouse_endpoint_service_id" {
   description = "The service ID of the VPC endpoint service for Clickhouse"
   default     = ""
 }
-
-##########################################
-# Internal Service                       #
-##########################################
-
-variable "kubernetes_cluster_oidc_issuer_url" {
-  type        = string
-  description = "OIDC issuer URL for the Kubernetes cluster. Can be determined using `kubectl get --raw /.well-known/openid-configuration`"
-  default     = ""
-}