When used in a terminal, the `list` reporter prints out information
about test steps to help debugging. In non-TTY environments like GitHub
Actions, currently it doesn't.
This PR changes that, so that in non-TTY environments you'll see the
"step end" messages appearing, but not the "step begin" messages. This
is a good middleground, because it helps the user understand test
progress, without being too verbose.
Closes https://github.com/microsoft/playwright/issues/31674