refactor(utxo-lib): `parsed` -> `parsedInput` in fromHalfSigned.ts
refactor(utxo-lib): `parsed` -> `parsedInput` in fromHalfSigned.ts

Better readability

Issue: BG-57748

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS