`logging.shutdown()` should clear `logging._handlerList` if that's what it's called with

Bug report

Bug description:

In the wild, I've encountered situations where logging.shutdown gets called more than once in a process.

The current implementation is called with logging._handlerList by default, meaning that handlers can have their flush() and close() methods called more than once, which can cause bad things to happen if those handlers are not amenable to being closed more than once.

If logging.shutdown() is processing logging._handlerList, it should clear that list once it finished to prevent handlers having their flush() and close() methods called more than once.

CPython versions tested on:

3.12, CPython main branch

Operating systems tested on:

Linux, macOS

Linked PRs

• gh-129681

Comienza en el punto de entrada logging.shutdown() e inspecciona cómo procesa logging._handlerList, incluidas las llamadas repetidas a flush() y close() descritas en el informe. Confirma que shutdown vacía la lista de handlers predeterminada después de procesarla y verifica que las llamadas repetidas a shutdown no vuelvan a procesar los mismos handlers.