Issue #1944572 by hass, Cottser, idebr: Remove "ul.menu" dependency to prevent theme clashes

core/modules/shortcut/shortcut.module

core/modules/shortcut/src/Tests/ShortcutLinksTest.php

.../modules/shortcut/src/Tests/ShortcutTranslationUITest.php

core/modules/toolbar/css/toolbar.icons.theme.css

core/modules/toolbar/css/toolbar.menu.css

core/modules/toolbar/css/toolbar.theme.css

core/modules/toolbar/js/toolbar.menu.js

core/modules/toolbar/js/views/MenuVisualView.js

core/modules/toolbar/src/Menu/ToolbarMenuLinkTree.php

core/modules/toolbar/templates/menu--toolbar.html.twig

...es/toolbar/tests/modules/toolbar_test/toolbar_test.module

core/modules/toolbar/toolbar.module

core/modules/toolbar/toolbar.services.yml

core/modules/user/user.module