walletprocesspsbt has long supported sign=false to update a PSBT without producing signatures.
This PR adds the same mode to descriptorprocesspsbt.
This lets descriptor-based workflows add UTXO data, scripts, and key origin metadata while leaving signing for a later step or another participant.
Includes test coverage that sign=false:
complete=false without hex
walletprocesspsbt already supports updating a PSBT without signing.
Add the same mode to descriptorprocesspsbt so descriptor-based
callers can add descriptor and UTXO metadata before signatures are
produced.
The default remains sign=true, preserving existing behavior.
Verify that sign=false still fills descriptor and UTXO metadata while
leaving the input unsigned and unfinalized. This covers the new
update-only mode without broadening the existing descriptorprocesspsbt
test.
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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35425.
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