[3.12] gh-110378: Close invalid generators in contextmanager and asynccontextmanager (GH-110499) (#110588)

contextmanager and asynccontextmanager context managers now close an invalid
underlying generator object that yields more then one value.
(cherry picked from commit 96fed66a65097eac2dc528ce29c9ba676bb07689)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>