move GetBehindAhead function to gitserver package (!36546) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge ao/move-GetBehindAhead-to-gitserver-pkg into main Jun 03, 2022

Created by: sashaostrikov

Part of https://github.com/sourcegraph/sourcegraph/issues/33280

Depends on https://github.com/sourcegraph/sourcegraph/pull/36539

Test plan

Existing tests should pass