Move SLES builds to use RMT instead of SMT
This is in prep for SLES 15 which doesn't have SMT support
Part of https://gitlab.com/gitlab-org/distribution/team-tasks/-/issues/897
Edited by DJ Mountney
This is in prep for SLES 15 which doesn't have SMT support
Part of https://gitlab.com/gitlab-org/distribution/team-tasks/-/issues/897