As discussed at #27845, it would be very helpful to be able to have flutter test report details about failures, without printing a line for every success.

This is already what it mostly does by default for interactive use (the exceptions to "mostly" include skips and tests with noisy output of their own), by overwriting the same line repeatedly using terminal escape sequences. But that's not available in a CI context.

Recent versions of package:test support this, with --reporter failures-only. So we just need to accept that argument ourselves, and pass it through.