drop backward compatibility of settings + run forward compatibility only once #58250
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fixes #57671
! This is for the release 3.34 branch !
If we merge this, we need to take the same approach in the new releases too.
I don't think it makes a lot of sense to keep updating settings fro 3.30 and older since 3.34 is now the LTR. We can do the same approach (migrate only once) in new releases so moving directly from 3.28 to 3.40 would work (which is probable in big organisations).