Confirm/improve priority of the graphql query obtaining the blob content

Proposal

During our Performance Round TableSource Code the question about the order in which we request the blob content information came up.

It seemed like the blob content came after many many requests.

However, inspecting one example (https://gitlab.com/gitlab-org/gitlab/-/blob/master/.rubocop_todo.yml) seems like we do get the content in the Blob info request (which is requested in StartupJS).

Perhaps the example we saw in the call was a fallback to a rouge-rendered syntax highlighting?

Regardless, let's confirm we're requesting the blob content as soon as possible.