dev/ci: put backend, code-intel integration tests on baremetal

Created by: bobheadxi

We are seeing weird state issues where servers are starting up already initialized, somehow: https://buildkite.com/sourcegraph/sourcegraph/builds/125178#535b15a3-fb00-4dbb-85ee-0f5ab71ffb32/360-385

Only seems to show up on the non-e2e-agent-tests: https://sourcegraph.grafana.net/goto/xFEEwH1nk?orgId=1 - maybe it's something with the agents?