Load star rating breakdown on the server (not the client)

[kumar303]

Describe the problem and steps to reproduce it:

• Go to an add-on detail page that includes a star rating breakdown (see https://github.com/mozilla/addons/issues/11976)
• Refresh the page

What happened?

The star rating breakdown should render immediately, without any loading indicators

What did you expect to happen?

You see loading indicators while the client fetches the data.

Anything else we should know?

It is important to load this data on the server for SEO so that crawlers can see star rating breakdowns for each add-on.

The problem lies in how we can only rely on a double render to load data on the server. The first render dispatches an action to load the add-on. The second render dispatches an action to load the star rating data but this is too late for server side rendering.

[kumar303]

The new designs will address this in a new way. That is, we won't need SSR here.