Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36040 and https://gitlab.com/gitlab-org/gitlab-ce/issues/36037
@jschatz1 Adds commit_path (and some other properties) to the last_commit object on the tree JSON endpoint.
It should be used here: http://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/assets/javascripts/repo/helpers/repo_helper.js#L221