lima disk delete should work the same way as limactl delete

[jandubois]

It feels inconsistent to me that a locked disk will abort the command, but a non-existing disk is simply skipped:

limactl disk rm foo bar

If foo doesn't exist, bar will still be deleted. But if foo exists and is locked, then bar will not be deleted (and there is no message to the effect that additional disks have been skipped due to the error).

I think a locked disk should be logged as an error, but additional disks should still be processed.

And then I wonder if failures of deleteDisk() should be treated the same way too: log an error, but continue to attempt deleting the remaining disks?

Of course the command must exit with a non-zero status code if any disk couldn't be deleted. I'm not sure how non-existing disks should be treated: should they also cause a non-zero error?

@AkihiroSuda WDYT?

Originally posted by @jandubois in #1065 (comment)