The refs hash is used to determine what branches and tags have a commit
as head in the network graph. The previous implementation depended on
Rugged#references. The problem with this implementation was that it
depended on rugged, but also that it iterated over all references and
thus loading more data than needed if for example the project uses CI/CD
environments, Pipelines, or Merge Requests.
Given only refs are checked the network cares about the GraphHelper#refs
method has no need to reject those, simplifying the method.
Closesgitlab-org/gitaly#880
Printing just `[<number>]` was confusing - it looks like a ghost branch or something.
Add `note` (or `notes`, depending on number of notes) to give some details of what this number means.
Refactor code to follow DRY principle.
