fix(label): include the ion-text-wrap class styles for larger font (#18374)

- updates all e2e tests to use the CSS classes instead of attributes

core/src/components/slides/test/app-intro/index.html

@@ -44,7 +44,7 @@
         <ion-slide>
           <img src="https://images.unsplash.com/photo-1490718687940-0ecadf414600?auto=format&fit=crop&w=1352&q=80&ixid=dW5zcGxhc2guY29tOzs7Ozs%3D"
             class="slide-image" />
-          <div padding>
+          <div class="ion-padding">
             <h2 class="slide-title">
               Welcome to
               <b>ICA</b>
@@ -60,7 +60,7 @@
         <ion-slide>
           <img src="https://images.unsplash.com/photo-1504703500545-4c4ee081b155?auto=format&fit=crop&w=1350&q=80&ixid=dW5zcGxhc2guY29tOzs7Ozs%3D"
             class="slide-image" />
-          <div padding>
+          <div class="ion-padding">
             <h2 class="slide-title">What is Ionic?</h2>
             <p>
               <b>Ionic Framework</b> is an open source SDK that enables developers to build high quality mobile apps with web
@@ -71,7 +71,7 @@
         <ion-slide>
           <img src="https://images.unsplash.com/photo-1501879779179-4576bae71d8d?auto=format&fit=crop&w=1350&q=80&ixid=dW5zcGxhc2guY29tOzs7Ozs%3D"
             class="slide-image" />
-          <div padding>
+          <div class="ion-padding">
             <h2 class="slide-title">What is Ionic Pro?</h2>
             <p>
               <b>Ionic Pro</b> is a powerful set of services and features built on top of Ionic Framework that brings a totally