feat: 🎸 Add component sidebar in Admin UI

Add layout component sidebar in Admin UI and a view (Session recordings)
already using it

✅ Closes: ICU-8145

ui/admin/tests/integration/components/layout/sidebar-test.js

@@ -0,0 +1,23 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'admin/tests/helpers';
+import { render } from '@ember/test-helpers';
+import { hbs } from 'ember-cli-htmlbars';
+
+module('Integration | Component | layout/sidebar', function (hooks) {
+  setupRenderingTest(hooks);
+
+  test('it renders', async function (assert) {
+    await render(hbs`
+      <Layout::Sidebar as |sb|>
+        <sb.body>Body content</sb.body>
+        <sb.sidebar>Sidebar content</sb.sidebar>
+      </Layout::Sidebar>
+    `);
+
+    assert.dom('.layout-sidebar').isVisible();
+    assert.dom('.layout-sidebar-body').isVisible();
+    assert.dom('.layout-sidebar-body').hasText('Body content');
+    assert.dom('.layout-sidebar-sidebar').isVisible();
+    assert.dom('.layout-sidebar-sidebar').hasText('Sidebar content');
+  });
+});