Reduce cyclomatic complexity in TvpProcessor::getInboundPath()

Hi @steinmb, thanks for the MR, but its still in draft, so not sure if its finished? The code will change a lot with the other issue. So I'm thinking of getting back to this after the other issue has been tested and merged and see what needs to be done here? What you think?

Ok code did not change a lot, can you point out what is still needed?