New: Make Release Group Outline Not Show as Required

(cherry picked from commit 89e363fd145ae6c531e6b3fa4fde258af05afca0)

Closes #2277

frontend/src/InteractiveImport/Interactive/InteractiveImportRowCellPlaceholder.tsx

@@ -0,0 +1,22 @@
+import classNames from 'classnames';
+import React from 'react';
+import styles from './InteractiveImportRowCellPlaceholder.css';
+
+interface InteractiveImportRowCellPlaceholderProps {
+  isOptional?: boolean;
+}
+
+function InteractiveImportRowCellPlaceholder(
+  props: InteractiveImportRowCellPlaceholderProps
+) {
+  return (
+    <span
+      className={classNames(
+        styles.placeholder,
+        props.isOptional && styles.optional
+      )}
+    />
+  );
+}
+
+export default InteractiveImportRowCellPlaceholder;