Remove no longer used notification_settings table

closes #5062

server/migrations/20230430213332-remove-notification-settings.js

@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = {
+  async up (queryInterface, Sequelize) {
+    await queryInterface.dropTable("notification_settings");
+  },
+
+  async down (queryInterface, Sequelize) {
+    throw new Error("Cannot undo this migration.")
+  }
+};