[Controller] Support deleting controller from sky cli non-interactively

[romilbhardwaj]

There's no way to bypass the delete prompt programmatically when terminating a controller:

$ sky down -y $CONTROLLER
WARNING: Tearing down the managed jobs controller. Please be aware of the following:
 * All logs and status information of the managed jobs (output of `sky jobs queue`) will be lost.
 * No in-progress managed jobs found. It should be safe to terminate (see caveats above).
To proceed, please type 'delete':

This makes it hard to clean up the controller in an non-interactive setting (e.g., airflow task).

Maybe it should respect -y or have some flag.

[Michaelvll]

It might work with -p?

[romilbhardwaj]

Hmm -p doesn't help either. abort() happens before the core.down() code path is called...

https://github.com/skypilot-org/skypilot/blob/800f7d6971bd604f266faebb33d044c7d5baca55/sky/cli.py#L2775-L2781

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