findFiles2New Should cancel return an [] array

[karthiknadig]

Testing #226670

Should it return CancellationError instead?

[andreamah]

Taking a quick look at finalized API, we don't seem to throw CancellationToken upon cancellation too much (especially considering that there are lots of APIs that have this token-to-cancel style of calling).

@jrieken You're probably the expert on whether we should be throwing CancellationToken- I'm willing to make the change if it's consistent with others.

[jrieken]

Let's stick with what the current API does.