Don't inline webpack JS runtime code

Froma https://create-react-app.dev/docs/advanced-configuration

> By default, Create React App will embed the runtime script into
> index.html during the production build. When set to false, the script
> will not be embedded and will be imported as usual. This is normally
> required when dealing with CSP.

gsa/package.json

@@ -71,7 +71,7 @@
     "test:coverage": "react-scripts test --coverage --maxWorkers 2",
     "lint": "eslint --max-warnings 0 src",
     "start": "react-scripts start",
-    "build": "react-scripts build",
+    "build": "INLINE_RUNTIME_CHUNK=false react-scripts build",
     "eject": "react-scripts eject",
     "storybook": "NODE_PATH=src start-storybook",
     "build-storybook": "NODE_PATH=src build-storybook",