fix(tool-admin): remove ToolAnswer records for unlinked catalogs

- Add default description when creating ToolAnswer.
- Remove ToolAnswer entries for questions whose catalogs are no longer linked to the tool

Author: sudip-khanal

apps/tool_picker/admin.py

@@ -295,12 +295,14 @@ def save_related(self, request, form, formsets, change):  # type: ignore[reportM
                         ),
                     },
                 )
-
-                # If it already exists, just update modified_by
                 if not created:
                     tool_answer.modified_by = request.user  # type: ignore[reportMissingTypeArgument]
                     tool_answer.save(update_fields=["modified_by"])
 
+        ToolAnswer.objects.filter(tool=obj).exclude(
+            question__catalog__in=obj.catalogs.all(),
+        ).delete()
+
 
 # ============================================================================
 # User Submission Models Admin