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/picker/picker.tsx

@@ -2,7 +2,7 @@ import { Component, ComponentInterface, Element, Event, EventEmitter, Listen, Me
 
 import { Animation, AnimationBuilder, Config, CssClassMap, Mode, OverlayEventDetail, OverlayInterface, PickerButton, PickerColumn } from '../../interface';
 import { dismiss, eventMethod, present } from '../../utils/overlays';
-import { createThemedClasses, getClassMap } from '../../utils/theme';
+import { getClassMap } from '../../utils/theme';
 
 import { iosEnterAnimation } from './animations/ios.enter';
 import { iosLeaveAnimation } from './animations/ios.leave';
@@ -204,7 +204,11 @@ export class Picker implements ComponentInterface, OverlayInterface {
     return {
       'aria-modal': 'true',
       class: {
-        ...createThemedClasses(this.mode, 'picker'),
+        [`${this.mode}`]: true,
+
+        // Used internally for styling
+        [`picker-${this.mode}`]: true,
+
         ...getClassMap(this.cssClass)
       },
       style: {