Added boards bundle for groups/boards and added Karma trouble makers

app/assets/javascripts/pages/groups/boards/index.js

+import UsersSelect from '~/users_select';
+import ShortcutsNavigation from '~/shortcuts_navigation';
+import initBoards from '~/boards';
+
+document.addEventListener('DOMContentLoaded', () => {
+  new UsersSelect(); // eslint-disable-line no-new
+  new ShortcutsNavigation(); // eslint-disable-line no-new
+  initBoards();
+});

spec/javascripts/test_bundle.js

@@ -112,6 +112,9 @@ if (process.env.BABEL_ENV === 'coverage') {
   // exempt these files from the coverage report
   const troubleMakers = [
     './blob_edit/blob_bundle.js',
+    './boards/components/modal/empty_state.js',
+    './boards/components/modal/footer.js',
+    './boards/components/modal/header.js',
     './cycle_analytics/cycle_analytics_bundle.js',
     './cycle_analytics/components/stage_plan_component.js',
     './cycle_analytics/components/stage_staging_component.js',