test: add rpc_signrawtransaction logging

Summary:
This is a partial backport of Core PR18545
https://github.com/bitcoin/bitcoin/pull/18545/commits/9cdddae3b4efee071d71ba3b6629a53017332f6f

Test Plan: test/functional/test_runner.py rpc_signrawtransaction

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8925