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/item-option/item-option.tsx

@@ -64,6 +64,8 @@ export class ItemOption implements ComponentInterface {
     return {
       class: {
         ...createColorClasses(this.color),
+        [`${this.mode}`]: true,
+
         'item-option-disabled': disabled,
         'item-option-expandable': expandable,
         'ion-activatable': true,