[sarasi]

"who has went" would be a dialect form that a small number of English speakers from particular regions use. It's not standard and to most English speakers sounds like an error.

I don't think you need to worry about this too much- I honestly can't think of very many situations where I would use "I was gone"- about the only one would be to mean "I had left", but even then I probably wouldn't use it. Even "I had gone" is not used that often by most people. "I had been" would be much more common. We are more likely to use "gone" when talking about other people, since it means leave and not come back.