Files
bitcoin/src
merge-script f9032a4abb Merge bitcoin/bitcoin#31242: wallet, desc spkm: Return SigningProvider only if we have the privkey
f6a6d91205 test: add check for getting SigningProvider for a CPubKey (Sebastian Falbesoner)
62a95f5af9 test: refactor: move `CreateDescriptor` helper to wallet test util module (Sebastian Falbesoner)
493656763f desc spkm: Return SigningProvider only if we have the privkey (Ava Chow)

Pull request description:

  If we know about a pubkey that's in our descriptor, but we don't have the private key, don't return a SigningProvider for that pubkey.

  This is specifically an issue for Taproot outputs that use the H point as the resulting PSBTs may end up containing irrelevant information because the H point was detected as a pubkey each unrelated descriptor knew about.

  Split from #29675

ACKs for top commit:
  fjahr:
    ACK f6a6d91205
  theStack:
    re-ACK f6a6d91205
  furszy:
    utACK f6a6d91205. Only reviewed the actual change in detail, not the test commit.

Tree-SHA512: 30a196e611a0c5d9ebe5baf6d896caaa6af66f1615463dbb0c31e52604d53cf342922bb9967b3c697b47083d76b0485c77a5f545bd6381247c8bc44321c70f97
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