Remove the `ungroup_stats()` function #674

All 867 tests pass, 9 skipped in 1m 16s

1 files ±0 84 suites ±0 1m 16s ⏱️ ±0s
876 tests ±0 867 ✅ ±0 9 💤 ±0 0 ❌ ±0
1 882 runs ±0 1 185 ✅ ±0 697 💤 ±0 0 ❌ ±0

Results for commit 66be144. ± Comparison against earlier commit f93e88e.