Add tests for the re-applying of "already validated" Byron transactions and blocks

Byron transactions and blocks can be flagged as "already validated" or "previously applied" with respect to some ledger state and then be re-applied to that ledger state while skipping certain expensive checks such as cryptographic operations.

This functionality has been introduced in PR input-output-hk/ouroboros-network#862, the solution for issue input-output-hk/ouroboros-network#440.

We should write some tests for this functionality, perhaps similar to those that can be found in `cardano-ledger`: https://github.com/input-output-hk/cardano-ledger/pull/548