Now that Info-level logging is always logged, there is no further need for the "None" level, so remove it.
This is a partial backport of [[https://github.com/bitcoin/bitcoin/pull/28318 | core#28318]]
https://github.com/bitcoin/bitcoin/pull/28318/commits/667ce3e3297645527b07314e1d5a82275fb25845
Depends on D18271