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

patches/server/0013-Paper-Plugins.patch

@@ -5417,7 +5417,7 @@ new file mode 100644
 index 0000000000000000000000000000000000000000..884ddb16ee6a5b182e932abb53fdf38a4444d765
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/plugin/provider/type/paper/PaperPluginParent.java
-@@ -0,0 +1,258 @@
+@@ -0,0 +1,257 @@
 +package io.papermc.paper.plugin.provider.type.paper;
 +
 +import com.destroystokyo.paper.util.SneakyThrow;
@@ -5592,9 +5592,8 @@ index 0000000000000000000000000000000000000000..884ddb16ee6a5b182e932abb53fdf38a
 +                    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;