Remove dead NTN and NTC versions in Consensus

As of https://github.com/input-output-hk/ouroboros-network/pull/3699 and https://github.com/input-output-hk/ouroboros-network/pull/3696, there will be dead code in Consensus, such as `CardanoNodeToNodeVersionX` for X<5 etc.

This ticket is to delete those now-dead definitions and whatever that transitively kills, and so on.

# Acceptance criteria
We've removed all the dead-code and updated the `interface-CHANGELOG.md` (if there's anything to add there).

Start by locating the dead NTN and NTC version definitions in Consensus, including CardanoNodeToNodeVersionX for X<5, and trace the code they make unreachable. Remove the dead code and update interface-CHANGELOG.md if required; completion means all such dead code is gone.

Written by the indexing model from the issue text.