test: check that keyless P2A 'signing' via signrawtransactionwithkey
succeeds
#30576
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This small PR adds a sanity check to verify that transactions with P2A inputs can be 'signed' successfully, using the non-wallet RPC
signrawtransactionwithkey
. Note that in the this flow,SignStep
(which was also extended for the newANCHOR
output type in #30352) is never called, as signing is only tried if the locking script verification isn't successful already. See the review discussion #30352 (comment) ff.