fix(scaletest/workspacetraffic): wait for non-zero metrics before cancelling in TestRun#9663

johnstcn merged 3 commits intomaincoder/coder:mainfrom

cj/flake-workspacetraffic-testrun-ptycoder/coder:cj/flake-workspacetraffic-testrun-ptyCopy head branch name to clipboard