DEV: reset plugin added directory columns in testing (#13420)

spec/components/plugin/instance_spec.rb

@@ -604,6 +604,11 @@ describe Plugin::Instance do
   describe '#add_directory_column' do
     let!(:plugin) { Plugin::Instance.new }
 
+    after do
+      DirectoryItem.clear_plugin_queries
+      DirectoryColumn.clear_plugin_directory_columns
+    end
+
     it 'creates a directory column record' do
       plugin.add_directory_column('random_c', query: "SELECT COUNT(*) FROM users", icon: 'recycle')