refactor: Replace all old instances of Config with New Config (#1627)

Fixes #1184 
Previous PR's found [here](https://github.com/XRPLF/clio/pull/1593) and
[here](https://github.com/XRPLF/clio/pull/1544)

tests/unit/ConfigTests.cpp

@@ -20,6 +20,7 @@
 #include "util/Assert.hpp"
 #include "util/LoggerFixtures.hpp"
 #include "util/config/Config.hpp"
+#include "util/log/Logger.hpp"
 
 #include <boost/filesystem/operations.hpp>
 #include <boost/json/conversion.hpp>
@@ -31,7 +32,6 @@
 #include <cstdint>
 #include <cstdio>
 #include <fstream>
-#include <optional>
 #include <stdexcept>
 #include <string>
 #include <vector>