Update remaining balanceTx unit and property tests to Conway

[Anviking]

Why?

The cardano-balance-tx:test test suite, in particular Internal.Cardano.Write.Tx.BalanceSpec has several tests only running in the Babbage era, and not in Conway. The main balanceTx property is already running in both eras, but there are other tests which aren't.

For continued confidence when supporting new node bumps and future eras, these tests should be updated to use Conway. Ideally, they should automatically be run in all recent eras, such that we cannot forget to update them when a new era is introduced.

The https://cardanofoundation.atlassian.net/browse/ADP-3413 e2e test failure showed that coverage in both unit and integration tests were lacking in the context of balancing plutus txs in Conway.

What?

All Internal.Cardano.Write.Tx.BalanceSpec tests should run in either Conway or Conway and Babbage.

How?

No response

[Anviking]

Draft PR: #4762