Add collection and appbar tests (#23614)

...rc/metabase/collections/components/CollectionEditMenu.jsx

...ections/components/CollectionHeader/CollectionCaption.tsx

...omponents/CollectionHeader/CollectionHeader.unit.spec.tsx

...nd/src/metabase/collections/components/CollectionIcon.jsx

frontend/src/metabase/nav/components/AppBar/AppBar.tsx

...d/src/metabase/nav/components/AppBar/AppBar.unit.spec.tsx

...src/metabase/nav/components/AppBar/AppBarLarge.styled.tsx

...src/metabase/nav/components/AppBar/AppBarSmall.styled.tsx

frontend/src/metabase/nav/components/AppBar/AppBarToggle.tsx

...c/metabase/nav/components/SidebarButton/SidebarButton.tsx

...d/test/__support__/e2e/helpers/e2e-ui-elements-helpers.js

...nd/test/metabase/scenarios/dashboard/dashboard.cy.spec.js

frontend/test/metabase/scenarios/question/saved.cy.spec.js