fix(storybook): fix broken Storybook stories during development (#29587)

Signed-off-by: hainenber <dotronghai96@gmail.com>

superset-frontend/webpack.config.js

@@ -75,6 +75,7 @@ if (!isDevMode) {
 const plugins = [
   new webpack.ProvidePlugin({
     process: 'process/browser.js',
+    ...(isDevMode ? { Buffer: ['buffer', 'Buffer'] } : {}), // Fix legacy-plugin-chart-paired-t-test broken Story
   }),
 
   // creates a manifest.json mapping of name to hashed output used in template files
@@ -336,6 +337,7 @@ const config = {
       fs: false,
       vm: require.resolve('vm-browserify'),
       path: false,
+      ...(isDevMode ? { buffer: require.resolve('buffer/') } : {}), // Fix legacy-plugin-chart-paired-t-test broken Story
     },
   },
   context: APP_DIR, // to automatically find tsconfig.json