fix: only apply raises-exception tags for student notebooks, not instructor

Author: iamzoltan

generate_book_v2.py

@@ -235,7 +235,8 @@ def pre_process_notebook(file_path):
     content = open_in_colab_new_tab(content)
     content = change_video_widths(content)
     content = link_hidden_cells(content)
-    content = tag_cells_allow_errors(content)
+    if ARG == "student":
+        content = tag_cells_allow_errors(content)
     with open(file_path, "w", encoding="utf-8") as fh:
         json.dump(content, fh, indent=1, ensure_ascii=False)