Surface "synthetic" test passing to the reporters

[natebosch]

We currently hide tests that are "synthetic" after they pass.

test/pkgs/test_core/lib/src/runner/live_suite_controller.dart

Lines 140 to 144 in 09bf34e

	} else if (countSuccess) {
	_passed.add(liveTest);
	// A passing test that was once failing was retried
	_failed.remove(liveTest);
	}

We want to surface failures and since we don't have another test to associate them with, we report failures under a new test. A human doesn't need to see that they passed, but a machine might want to see this, especially following a run where it failed. It's better to model as a passing test than as a disappearing (previously failing) test.

This could likely get wrapped in with #1311