Convert Package Details page to use GraphQL

Context

We've done a lot of work to create GraphQL APIs for the GitLab Package Registry. With that work wrapping up in 14.1, it would be great to start updating the Package Registry UI to leverage the new API. This will help with performance and help to unblock future feature development.

Proposal

Refactor the package details page from using a mix of controllers/rest API to use the new GraphQL API.