Refactor Notifications to use Vue, and add clear all option (#3068)

[Notifications] Need a clear all notifications option #3006

* create new notifications indicator in vue, and sunset old one

* add notifications list overlay

* working notifications

* add support for progress notifications

* update percentage on mounted

* Markup cleanups in new Vue Notifications files

- Removed unneeded markup and class wrappers;
- Removed unneeded inline styling;

* remove example notifications

* fix lint errors

* make reviewer requested changes, remove old not needed files, add test

* update testTools to testUtils

Co-authored-by: charlesh88 <charlesh88@gmail.com>

src/plugins/notificationIndicator/pluginSpec.js

@@ -0,0 +1,71 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2020, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed 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.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+import NotificationIndicatorPlugin from './plugin.js';
+import Vue from 'vue';
+import {
+    createOpenMct
+} from 'testUtils';
+
+describe('the plugin', () => {
+    let notificationIndicatorPlugin,
+        openmct,
+        indicatorObject,
+        indicatorElement,
+        parentElement,
+        mockMessages = ['error', 'test', 'notifications'];
+
+    beforeEach((done) => {
+        openmct = createOpenMct();
+
+        notificationIndicatorPlugin = new NotificationIndicatorPlugin();
+        openmct.install(notificationIndicatorPlugin);
+
+        parentElement = document.createElement('div');
+
+        indicatorObject = openmct.indicators.indicatorObjects.find(indicator => indicator.key === 'notifications-indicator');
+        indicatorElement = indicatorObject.element;
+
+        openmct.on('start', () => {
+            mockMessages.forEach(message => {
+                openmct.notifications.error(message);
+            });
+            done();
+        });
+
+        openmct.startHeadless();
+    });
+
+    describe('the indicator plugin element', () => {
+        beforeEach(() => {
+            parentElement.append(indicatorElement);
+            return Vue.nextTick();
+        });
+
+        it('notifies the user of the number of notifications', () => {
+            let notificationCountElement = parentElement.querySelector('.c-indicator__count');
+
+            expect(notificationCountElement.innerText).toEqual(mockMessages.length.toString());
+        });
+    });
+
+});