feat: mock plugins with real configs

so you no longer need to comment out xpack config in the kibana.dev.yml

plugins/xpack_main/index.js

@@ -0,0 +1,30 @@
+import { XPACK_INFO_API_DEFAULT_POLL_FREQUENCY_IN_MILLIS } from "../constants";
+
+export function xpackMain(kibana) {
+  return new kibana.Plugin({
+    require: [],
+    name: "xpack_main",
+    id: "xpack_main",
+    configPrefix: "xpack.xpack_main",
+    config(Joi) {
+      return Joi.object({
+        enabled: Joi.boolean().default(true),
+        telemetry: Joi.object({
+          enabled: Joi.boolean().default(true),
+          url: Joi.when("$dev", {
+            is: true,
+            then: Joi.string().default(
+              "https://telemetry-staging.elastic.co/xpack/v1/send"
+            ),
+            otherwise: Joi.string().default(
+              "https://telemetry.elastic.co/xpack/v1/send"
+            )
+          })
+        }).default(),
+        xpack_api_polling_frequency_millis: Joi.number().default(
+          XPACK_INFO_API_DEFAULT_POLL_FREQUENCY_IN_MILLIS
+        )
+      }).default();
+    }
+  });
+}