Create a GraphQL query for contributed groups

What / Why

For &13781 (closed) we need a way to show groups that a user has contributed to in the Contributed tab. This request is very similar to #450191 (closed) which was made for Projects.

Ideally we can access this from the currentUser graphql query. Something like:

query {
  currentUser {
    contributedGroups {
      nodes {
        ...Group
      }
    }
  }
}

Implementation Plan

TBD