Disable NGINX request buffering for LFS routes
A problem with NGINX proxy buffering was seen here: https://gitlab.com/gitlab-org/gitlab-ce/issues/31871#note_29478568
A fix was added to omnibus here: omnibus-gitlab!1569 (merged)
I think it makes more sense to disable request buffering in workhorse for these routes, as mentioned here: !62 (comment 30308789) - this way installation-from-source and other users can benefit too.