Remove NoNoncense-specific test from CI

Author: juulSme

.github/workflows/ci_workflow.yml

@@ -68,8 +68,6 @@ jobs:
         run: mix compile --warnings-as-errors
       - name: Run tests
         run: mix test
-      - name: Node shutdown on machine ID conflict test
-        run: ./test/test_conflict_guard.sh
       - name: Create docs
         if: matrix.elixir == '1.18.x'
         run: mix docs