[3.13] Add test checking value of a TypedDict's __total__ attribute when there is an assignment in the class body. (GH-130460) (#130462)

Add test checking value of a TypedDict's __total__ attribute when there is an assignment in the class body. (GH-130460)

In relation to GH-109544 which changed this behavior.
(cherry picked from commit d8ce092fe4e98fec414f4e60cfc958b3ac3ec9a3)

Signed-off-by: Daniel Sperber <github.blurry@9ox.net>
Co-authored-by: Daraan <github.blurry@9ox.net>