move @kbn/storybook to devDeps (#68791)

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/package.json

@@ -36,6 +36,7 @@
     "@kbn/es": "1.0.0",
     "@kbn/expect": "1.0.0",
     "@kbn/plugin-helpers": "9.0.2",
+    "@kbn/storybook": "1.0.0",
     "@kbn/test": "1.0.0",
     "@kbn/utility-types": "1.0.0",
     "@storybook/addon-actions": "^5.2.6",
@@ -199,7 +200,6 @@
     "@kbn/config-schema": "1.0.0",
     "@kbn/i18n": "1.0.0",
     "@kbn/interpreter": "1.0.0",
-    "@kbn/storybook": "1.0.0",
     "@kbn/ui-framework": "1.0.0",
     "@mapbox/geojson-rewind": "^0.4.1",
     "@mapbox/mapbox-gl-draw": "^1.1.2",