gh-145546: unittest.util: fix sorted_list_difference tail deduplication
#241697
| Job | Run time |
|---|---|
| 4s | |
| 4s | |
| 8s |
sorted_list_difference tail deduplication
#241697
| Job | Run time |
|---|---|
| 4s | |
| 4s | |
| 8s |