Unify the printing of the logs between bar-with-logs and raw

Make the printing of the build logs systematically go through the
logger, and replicate the behavior of `no-build-output` by having two
different loggers (one that prints the build logs and one that doesn't)

src/libmain/loggers.hh

@@ -6,6 +6,7 @@ namespace nix {
 
 enum class LogFormat {
   raw,
+  rawWithLogs,
   internalJson,
   bar,
   barWithLogs,