Replace LogPrintfCategory with alternative unconditional log statements.
Remove LogPrintfCategory (would be done after core#30790 if not for missing benchmark backports, we can do it immediately)
This concludes backport of core#28318
https://github.com/bitcoin/bitcoin/pull/28318/commits/e60fc7d5d34f23cccbff6e4f5f3d716fa8dad50c
Depends on D18275