fix(components): include mode classes on components for use in shadow (#17838)

- 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

core/src/components/toggle/toggle.tsx

@@ -195,6 +195,7 @@ export class Toggle implements ComponentInterface {
 
       class: {
         ...createColorClasses(color),
+        [`${this.mode}`]: true,
         'in-item': hostContext('ion-item', el),
         'toggle-activated': activated,
         'toggle-checked': checked,