Use more efficient thread pool API on Windows (#60917)

This interface uses fewer syscalls and has less internal synchronization
(since the `TP_WORK` object is not exposed).

Release Notes:

- N/A
72656afa6dJohn Tur committed on 7/14/2026, 4:40:22 PM· committed by GitHubparenta1230fc
1 file changedLine totals unavailable