Device Manager - add new labsed session manager screen (PSG-636) (#9119)

* add feature_new_device_manager labs flag

* add generic settings tab container

* settingstab section styles

* add session manager tab to user settings

* add sessions tab case to UserSettingDialog test

* fussy import ordering

* remove posthog tracking

* i18n

test/components/views/settings/tabs/SettingsTab-test.tsx

@@ -0,0 +1,30 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+import React, { ReactElement } from 'react';
+import { render } from '@testing-library/react';
+
+import SettingsTab, { SettingsTabProps } from '../../../../../src/components/views/settings/tabs/SettingsTab';
+
+describe('<SettingsTab />', () => {
+    const getComponent = (props: SettingsTabProps): ReactElement => (<SettingsTab {...props} />);
+    it('renders tab', () => {
+        const { container } = render(getComponent({ heading: 'Test Tab', children: <div>test</div> }));
+
+        expect(container).toMatchSnapshot();
+    });
+});
+

test/components/views/settings/tabs/__snapshots__/SettingsTab-test.tsx.snap

@@ -0,0 +1,22 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<SettingsTab /> renders tab 1`] = `
+<div>
+  <div
+    class="mx_SettingsTab"
+  >
+    <h2
+      class="mx_Heading_h2"
+    >
+      Test Tab
+    </h2>
+    <div
+      class="mx_SettingsTab_sections"
+    >
+      <div>
+        test
+      </div>
+    </div>
+  </div>
+</div>
+`;