Mark Florian authored May 27, 2021 and Frédéric Caplette committed Jun 08, 2021

This is a renderless component that encapsulates the
query/mutation behaviours of working with UserCallouts.

This adds the component and specs, and also moves the existing
get_user_callouts.query.graphql file to a shared location.

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/332691.