Provide clearer failure-reason when wallet is not syncing

[Anviking]

Overview

• I have used a custom failure reason for A newly created wallet can sync with the chain

Comments

Previously (note the "predicate failed"):

  test/integration/Cardano/WalletSpec.hs:53:13:
  1) Cardano.WalletSpec A newly created wallet can sync with the chain
       predicate failed on: SlotId {epochNumber = 0, slotNumber = 0}

Now:

  test/integration/Cardano/WalletSpec.hs:56:17:
  1) Cardano.WalletSpec A newly created wallet can sync with the chain
       The wallet tip is still SlotId {epochNumber = 0, slotNumber = 0}

[KtorZ]

@Anviking Have you ran into this failure locally 🤔 ?

[Anviking]

Yes

[Anviking]

Likely because I was working on the TxWitness decoder, though.