tc: [utxo] Fix Under-Reported Solvency

ZlyDevMayarequested to merge
zoly/tc/ursa/utxo-solvency into develop

Implements thorchain/thornode!3514 (merged), thorchain/thornode!3493 (merged)

Summary by CodeRabbit

  • Refactor
    • Simplified mempool and pending-transaction handling across Bitcoin and Dash clients by consolidating conditional checks to reduce branching.
    • Streamlined UTXO selection logic for Bitcoin, Dash and Zcash signers to broaden and simplify input consideration, improving transaction processing consistency without changing external behavior.
Edited by Ghost User

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