Have test client reload logging when logging setting changed

[Jake Howard]

When changing the LOGGING setting (eg in tests), logging config isn't reconfigured to match.

This can be fairly easily added in a project:

@receiver(setting_changed)
def reload_logging_config(*, setting: str, **kwargs: Any) -> None:
    if setting in {"LOGGING", "LOGGING_CONFIG"}:
        configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)

But it would be nice if this was handled by default. This snippet appears to do what I need, but there might be edge cases I've not considered.

[Jacob Walls]

(eg in tests)

Assuming we're to add this in django/test/signals.py, that makes good sense to me and fits right in with the other receivers there.

[Jacob Walls <jacobtylerwalls@…>]

In 2d7f899d:

Fixed #36958 -- Reloaded logging config when logging settings are changed in tests.

Thanks JaeHyuck Sa and Jake Howard for the reviews.