Add setting for proxy online mode status

TODO: Add isProxyOnlineMode check to Metrics

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -1891,7 +1891,7 @@ public final class CraftServer implements Server {
         if (result == null) {
             GameProfile profile = null;
             // Only fetch an online UUID in online mode
-            if (this.getOnlineMode() || org.spigotmc.SpigotConfig.bungee) { // Spigot: bungee = online mode, for now.
+            if (this.getOnlineMode() || io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode()) { // Paper - Add setting for proxy online mode status
                 // This is potentially blocking :(
                 profile = this.console.getProfileCache().get(name).orElse(null);
             }