Apply timeout_graceful_shutdown when hot-reloading

[jamesh1999]

As seen in #2000, there is some uncertainty about Windows actually killing a uvicorn server to hot reload. I have raised #2604 which I think is useful as it is often sufficient to trigger a clean shutdown. However, I still run into issues when running the server headlessly (CI pipelines in particular).

I would like to use the existing config option --timeout-graceful-shutdown to forcibly terminate the server if it still doesn't reload. This way there is no chance for the server to keep running indefinitely.

[jamesh1999]

I'll set up the MR for this. Don't think it's anything too controversial and it should be the end of all the last Windows hot-reloading issues