Set the delegator target to `TreeEntryPresenter`
The following discussion from !69823 should be addressed:
- [ ] @godfat-gitlab started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69823#note_680738262):
> :thinking: This looks like `lib/gitlab/graphql/representation/tree_entry.rb` which is yet another `SimpleDelegator`.
>
> Of course I think we can leave it for now.
issue