mitigated most bugprone-unused-return-value clang-tidy warnings in test code when we enable it for *all* functions
#16177
| Job | Run time |
|---|---|
| 9m 26s | |
| 2m 36s | |
| 7m 40s | |
| 3m 34s | |
| 9m 9s | |
| 2m 47s | |
| 7m 37s | |
| 2m 6s | |
| 44m 55s |