Add Git SSH / Shell limits

See merge request gitlab-org/gitlab!87088

(cherry picked from commit a7e74bf2b7f1417cf9bb4e78689a360c433ecc49)

b4297993 Adds git ssh section
223efd66 Apply 2 suggestion(s) to 1 file(s)
59f14866 Apply 1 suggestion(s) to 1 file(s)