code monitoring: fix flaky tests

Created by: limitedmage

Fixes #32643 (closed)

Test plan

• Make tests pass several times
  • Run 1: https://buildkite.com/sourcegraph/sourcegraph/builds/137718
  • Run 2: https://buildkite.com/sourcegraph/sourcegraph/builds/137721
  • Run 3: https://buildkite.com/sourcegraph/sourcegraph/builds/137723
  • Run 4: https://buildkite.com/sourcegraph/sourcegraph/builds/137727
  • Run 5: https://buildkite.com/sourcegraph/sourcegraph/builds/137909