Run tests step reveals implementation detail in displayed script

[mcafaro]

The intent of the run tests step displaying its generated script is so a user can copy and paste it locally to reproduce what is occurring on the CI system. However, it looks like whatever we are doing to zip up the test results is moving us further away from having that script be a useful reproduction artifact. It would be useful if the actual artifact zipping was occurring in the script displayed to the user, rather than hidden behind the scenes in the plugin code.