Add regression test for add() after remove() with hash collision in set#143781

Add regression test for add() after remove() with hash collision in set #143781

serhiy-storchaka wants to merge 1 commit intopython:main python/cpython:mainfrom

serhiy-storchaka:test_hash_collision_remove_add serhiy-storchaka/cpython:test_hash_collision_remove_addCopy head branch name to clipboard