Test PlutusV3's txInfoCurrentTreasuryAmount

[catch-21]

1. • Build tx not exposing treasury amount to plutus
     • Expect txInfoCurrentTreasuryAmount is Nothing

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2. • Build tx exposing treasury amount to plutus
     • Expect txInfoCurrentTreasuryAmount is Just Value
     • Check current treasury amount:
       • without withdrawal
       • whilst withdrawing
       • after withdrawing

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