remove data.external.secret_token

This is not used anymore and doesn't work with the
updated secret_token.sh script.

testing/infra/terraform/modules/ec_deployment/deployment.tf

@@ -185,6 +185,9 @@ resource "null_resource" "secret_token" {
   }
 }
 
+# Since the secret token value is set in the APM Integration policy, we need
+# to extract it from there.
+# Load it from secret_token_file as a sensitive variable.
 data "local_sensitive_file" "secret_token" {
   filename   = local.secret_token_file
   depends_on = [null_resource.secret_token]
@@ -216,16 +219,6 @@ resource "null_resource" "custom_apm_integration_pkg" {
   }
 }
 
-# Since the secret token value is set in the APM Integration policy, we need
-# an "external" resource to run a shell script that returns the secret token
-# as {"value":"SECRET_TOKEN"}.
-data "external" "secret_token" {
-  count       = var.integrations_server ? 1 : 0
-  depends_on  = [local_file.secret_token]
-  program     = ["/bin/bash", "-c", "scripts/secret_token.sh"]
-  working_dir = path.module
-}
-
 resource "null_resource" "drop_pipeline" {
   count = var.drop_pipeline ? 1 : 0
   triggers = {