BREAKING CHANGES
The deprecated `ion-anchor` component has been removed in favor using `ion-router-link`. It should still only be used with vanilla and Stencil JavaScript projects. For Angular projects, use an `<a>` and `routerLink` with the Angular router.
- removes mode-less component classes from the internal CSS, use element instead
- adds mode specific classes `md` or `ios` for styling inside of shadow components
- adds e2e test that verifies mode classes exist on all ionic components, plus checks for specific classes that the components need for internal styling
fixes#17608