test: Tests and Storybook entry for the ModalTriggerComponent (#13213)

* Kickstart tests

* Finalize tests

* Add storybook entry

* Remove unnecessary args types

superset-frontend/spec/javascripts/components/ModalTrigger_spec.jsx

@@ -1,33 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-import React from 'react';
-
-import ModalTrigger from 'src/components/ModalTrigger';
-
-describe('ModalTrigger', () => {
-  const defaultProps = {
-    triggerNode: <i className="fa fa-link" />,
-    modalTitle: 'My Modal Title',
-    modalBody: <div>Modal Body</div>,
-  };
-
-  it('is a valid element', () => {
-    expect(React.isValidElement(<ModalTrigger {...defaultProps} />)).toBe(true);
-  });
-});