fix: don't leak goroutines if there are no files to watch #822
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This fixes an issue where we were leaking many goroutines especially during tests, even though there are no files to watch.
Those goroutines are cancelable via the context passed in, but we rarely do that in test code. And if we do, we spawn literally thousands of goroutines before doing one big cancel at the end.
IMO, this whole watching code should either go away or be refactored so it is more obvious that it spawns background goroutines.