Geo: Endpoints that facilitate proxying Git SSH requests may need to check the Geo IP whitelist

https://gitlab.com/gitlab-org/gitlab/-/blob/v12.10.5-ee/ee/lib/api/geo.rb#L101

Should these proxy_git_ssh endpoints call check_gitlab_geo_request_ip!?

Should we move the calls to before { check_gitlab_geo_request_ip! }?