Consider using linear depth buffer in RTAO

[florianschut]

Is your design request related to a problem? Please describe.
We have a clearer idea of how to omit self-intersection but the problem is still persistent

Describe the solution you'd like
Test if the situation improves when RTAO changes to a linear depth buffer.

Describe alternatives you've considered
The current situation works when no unrealistic settings for far and near plane are uses. I'd like to see if self-intersection decreases for even more scenarios when a linear depth buffer is used. I also used a position GBuffer in the past but this was removed due to bandwidth concerns.