dev/ci: remove set -x in all tests
Created by: bobheadxi
IMO the utility of these are quite debatable, and they make CI output quite difficult to read. Things we can do instead:
- Just add
set -xwhen you're debugging something - Add better messages with
echo - Move things to
sgwhere we might be able to add a-debugmode one day
Test plan
main-dry-run: https://buildkite.com/sourcegraph/sourcegraph/builds/152078
