default to --check-level=exhaustive internally / several related cleanups
#14742
| Job | Run time |
|---|---|
| 5m 5s | |
| 2m 10s | |
| 3m 55s | |
| 1m 25s | |
| 5m 35s | |
| 2m 14s | |
| 3m 41s | |
| 2m 34s | |
| 26m 39s |