[3.13] Revert "gh-115432: Add critical section variant that handles a NULL object (GH-115433)" (GH-118861) (#118872)

This reverts commit ad4f909e0e7890e027c4ae7fea74586667242ad3.

The API ended up not being used.
(cherry picked from commit 46c808172fd3148e3397234b23674bf70734fb55)

Co-authored-by: Sam Gross <colesbury@gmail.com>