Remove langchain endpoint env var set to default value (#295)

* Update variables.tf

* Update main.tf

Author: nfcampos

terraform/modules/chat_langchain_backend/main.tf

@@ -9,7 +9,6 @@ locals {
     WEAVIATE_URL         = var.weaviate_url
     WEAVIATE_API_KEY     = var.weaviate_api_key
     LANGCHAIN_TRACING_V2 = true
-    LANGCHAIN_ENDPOINT   = var.langchain_endpoint
     LANGCHAIN_API_KEY    = var.langsmith_api_key
     LANGCHAIN_PROJECT    = var.langchain_project
     FIREWORKS_API_KEY    = var.fireworks_api_key

terraform/modules/chat_langchain_backend/variables.tf

@@ -79,12 +79,6 @@ variable "max_instance_request_concurrency" {
   default     = 50
 }
 
-variable "langchain_endpoint" {
-  description = "Endpoint to use for LangSmith tracing"
-  type        = string
-  default     = "https://api.smith.langchain.com"
-}
-
 variable "fireworks_api_key" {
   description = "Fireworks api key to use for the backend"
   type        = string