Use authorisation if present, regardless of environment (#138817)

* fix: always send authorization to synth service when configured

* [CI] Auto-commit changed files from 'node scripts/build_plugin_list_docs'

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/synthetics/server/synthetics_service/service_api_client.ts

@@ -160,12 +160,11 @@ export class ServiceAPIClient {
             stack_version: this.kibanaVersion,
             is_edit: isEdit,
           },
-          headers:
-            process.env.NODE_ENV !== 'production' && this.authorization
-              ? {
-                  Authorization: this.authorization,
-                }
-              : undefined,
+          headers: this.authorization
+            ? {
+                Authorization: this.authorization,
+              }
+            : undefined,
           httpsAgent: this.getHttpsAgent(url),
         })
       );