grafana/ui: Enable storybook docs (#19930)

package.json

@@ -64,7 +64,6 @@
     "babel-loader": "8.0.5",
     "babel-plugin-angularjs-annotate": "0.10.0",
     "clean-webpack-plugin": "2.0.0",
-    "core-js": "2.6.9",
     "css-loader": "2.1.1",
     "enzyme": "3.9.0",
     "enzyme-adapter-react-16": "1.11.2",
@@ -209,6 +208,7 @@
     "calculate-size": "1.1.1",
     "classnames": "2.2.6",
     "clipboard": "2.0.4",
+    "core-js": "2.6.9",
     "d3": "4.13.0",
     "d3-scale-chromatic": "1.5.0",
     "eventemitter3": "2.0.3",