Log message if plugin bootstrap provided external plugin instead of throwing an exception (#8914)

patches/server/Paper-Plugins.patch

@@ -5592,9 +5592,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                    plugin = bootstrap.createPlugin(PaperPluginParent.this.context);
 +                }
 +
-+                // Don't allow plugins to load plugins other than the one defined in main. This restriction might not be necessary.
 +                if (!plugin.getClass().isAssignableFrom(Class.forName(PaperPluginParent.this.description.getMainClass(), true, plugin.getClass().getClassLoader()))) {
-+                    throw new IllegalArgumentException("Plugin provided must be the same type as main defined in plugin configuration!");
++                    logger.info("Bootstrap of plugin " + PaperPluginParent.this.description.getName() + " provided a plugin instance of class " + plugin.getClass().getName() + " which does not match the plugin declared main class");
 +                }
 +
 +                this.status = ProviderStatus.INITIALIZED;