This is an alternative / builds upon #75

The extra bits are:

• Run ava in verbose mode. This disables the fancy spinner and means that printing doesn't mess it up. I think ava is also doing some kind of output suppression but I haven't been able to fully verify, but anyway this turns it off.
• Instead of only suppressing some output, forward all of it to a string in memory, and then only print it all if the test fails. I think this gives a nice user experience by being very minimal when everything passes but giving you all the information when something fails.
• Uses typedTest.afterEach.always instead of typedTest.afterEach because the latter only runs on passing tests.

Merge / deployment checklist

• Run test builds as necessary. Can be on this repository or elsewhere as needed in order to test the change - please include links to tests in other repos!
  • CodeQL using init/analyze actions
  • 3rd party tool using upload action
• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.