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/refresher-content/refresher-content.tsx

@@ -43,6 +43,14 @@ export class RefresherContent implements ComponentInterface {
     }
   }
 
+  hostData() {
+    return {
+      class: {
+        [`${this.mode}`]: true,
+      }
+    };
+  }
+
   render() {
     return [
       <div class="refresher-pulling">