MC-3870: Background does not conform to border radius for banner, image, contained row & video

Add pagebuilder-overlay classes to slide overlay elements

Author: danmooney2

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/slide/collage-centered/preview.html

@@ -14,7 +14,7 @@
         <scope args="getUploader().getUiComponent()">
             <render />
         </scope>
-        <div class="pagebuilder-collage-overlay wysiwyg-container"
+        <div class="pagebuilder-overlay pagebuilder-collage-overlay wysiwyg-container"
              ko-style="data.overlay.style()"
              event="mousedown: activateEditor">
             <div class="inline-wysiwyg"

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/slide/collage-left/preview.html

@@ -15,7 +15,7 @@
         <scope args="getUploader().getUiComponent()">
             <render />
         </scope>
-        <div class="pagebuilder-collage-overlay wysiwyg-container"
+        <div class="pagebuilder-overlay pagebuilder-collage-overlay wysiwyg-container"
              attr="data.overlay.attributes"
              ko-style="data.overlay.style"
              event="mousedown: activateEditor">

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/slide/collage-right/preview.html

@@ -14,7 +14,7 @@
         <scope args="getUploader().getUiComponent()">
             <render />
         </scope>
-        <div class="pagebuilder-collage-overlay wysiwyg-container"
+        <div class="pagebuilder-overlay pagebuilder-collage-overlay wysiwyg-container"
              ko-style="data.overlay.style"
              event="mousedown: activateEditor">
             <div class="inline-wysiwyg"

app/code/Magento/PageBuilder/view/adminhtml/web/template/content-type/slide/poster/preview.html

@@ -12,7 +12,7 @@
     <div class="pagebuilder-slide-wrapper"
          ko-style="Object.assign(data.main.style(), data.desktop_image.styleNoReset())"
          event="{mouseover: onMouseOverWrapper, mouseout: onMouseOutWrapper}">
-        <div class="pagebuilder-poster-overlay"
+        <div class="pagebuilder-overlay pagebuilder-poster-overlay"
              attr="data.overlay.attributes"
              ko-style="data.overlay.style"
              css="data.overlay.css"