Storybook: Solve deployment issues (#22873)

packages/grafana-ui/.storybook/webpack.config.js

 const path = require('path');
+const TerserPlugin = require('terser-webpack-plugin');
+const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 module.exports = ({ config, mode }) => {
   config.module.rules = [
     ...(config.module.rules || []),
@@ -74,6 +76,18 @@ module.exports = ({ config, mode }) => {
     ],
   });
 
+  config.optimization = {
+    nodeEnv: 'production',
+    minimizer: [
+      new TerserPlugin({
+        cache: false,
+        parallel: false,
+        sourceMap: true,
+      }),
+      new OptimizeCSSAssetsPlugin({}),
+    ],
+  },
+
   config.resolve.extensions.push('.ts', '.tsx', '.mdx');
   config.stats = {
     warningsFilter: /export .* was not found in/,