Non-solo (skipped) tests spam on compact mode

[FMorschel]

I did just confirm that skipped tests always spam even in compact mode, we should just fix that imo.

Originally posted by @jakemac53 in dart-lang/tools#2107 (comment)

So we don't lose this.

Small repro:

void main() {
  test('2 * 2 equals 4', () {
    expect(2 * 2, equals(4));
  });
  test('3 - 1 equals 2', () {
    expect(3 - 1, equals(2));
  }, solo: true);
}

Current output for compact:

00:00 +0: test\a_test.dart: 2 * 2 equals 4
  Skip: does not have "solo"
00:00 +1 ~1: All tests passed!

If we replace the solo above with skip:

00:00 +1 ~1: All tests passed!