Remove dead protocolInfoPraosBabbage and protocolInfoPraosShelleyBased.

[dnadales]

These functions were dead code, and I could not find any reference to in in cardano-node.

This enables a simpler Conway integration, which is in progress in #3971

Checklist

• Branch
  • Commit sequence broadly makes sense
  • Commits have useful messages
  • New tests are added if needed and existing tests are updated
  • If this branch changes Consensus and has any consequences for downstream repositories or end users, said changes must be documented in interface-CHANGELOG.md
  • If this branch changes Network and has any consequences for downstream repositories or end users, said changes must be documented in interface-CHANGELOG.md
  • If serialization changes, user-facing consequences (e.g. replay from genesis) are confirmed to be intentional.
• Pull Request
  • Self-reviewed the diff
  • Useful pull request description at least containing the following information:
    • What does this PR change?
    • Why these changes were needed?
    • How does this affect downstream repositories and/or end-users?
    • Which ticket does this PR close (if any)? If it does, is it linked?
  • Reviewer requested

[HeinrichApfelmus]

Looks good from cardano-wallet downstream — I cannot find any usage of protocolInfoPraosBabbage or protocolInfoPraosShelleyBased, or more generally of the ProtocolInfo type. 👍