gh-94732: Fix KeyboardInterrupt race in asyncio run_forever() (GH-97765)

Ensure that the event loop's `_thread_id` attribute and the asyncgen hooks set by `sys.set_asyncgen_hooks()` are always restored no matter where a KeyboardInterrupt exception is raised.
(cherry picked from commit 3a49dbb98ccc1b90554ed181386316efa38adfba)

Co-authored-by: hetmankp <728670+hetmankp@users.noreply.github.com>