test: test that descriptorprocesspsbt removes non witness utxos in PSBT #32413

1. 
   rkrux commented at 11:49 am on May 3, 2025: contributor

   descriptorprocesspsbt RPC uses a different flow internally from the walletprocesspsbt RPC, which was already tested in the tests.

   This patch ensures that descriptorprocesspsbt RPC can correctly sign the PSBT while removing the non witness UTXOs in case of Segwit V1 only inputs.

   This was identified in the review of #31622 PR. Ref: #31622 (review)

2. test: test that descriptorprocesspsbt removes non witness utxos in PSBT

   `descriptorprocesspsbt` RPC uses a different flow internally from the
   `walletprocesspsbt` RPC, which was already tested in the tests.
   
   This patch ensures that `descriptorprocesspsbt` RPC can correctly sign
   the PSBT while removing the non witness UTXOs in case of Segwit V1 only
   inputs.
   
   This was identified in the review of #31622 PR.
   Ref: https://github.com/bitcoin/bitcoin/pull/31622#discussion_r1979463960

   87c8c6c7f5
3. 
   DrahtBot commented at 11:49 am on May 3, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32413.

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4. DrahtBot added the label Tests on May 3, 2025

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