chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

platform/ui/src/components/Thumbnail/Thumbnail.jsx

@@ -37,6 +37,7 @@ const Thumbnail = ({
         'flex flex-col flex-1 px-3 mb-8 cursor-pointer outline-none select-none group'
       )}
       id={`thumbnail-${displaySetInstanceUID}`}
+      data-cy={`study-browser-thumbnail`}
       onClick={onClick}
       onDoubleClick={onDoubleClick}
       role="button"