Add a drop-shadow toggle to control video shadow on Contentful (#32285)

GitOrigin-RevId: 87e20463a5bd817c69b7af5e4307174f688c1d7d

services/web/frontend/stylesheets/pages/cms.scss

@@ -443,6 +443,10 @@
     box-shadow:
       0 8px 16px 0 rgba(30 37 48 / 12%),
       0 4px 6px 0 rgba(30 37 48 / 12%);
+
+    &.no-shadow {
+      box-shadow: none;
+    }
   }
 
   /*