Add indent for the middle step: writing ICD responses in files

Summary:
Before this change, we used to write the result of one prompt as a dictionary in a single-line format for ICD-autocomplete and ICD-instruct benchmarks, which were not aligned with our final result format or MITRE format.  (see test plan below).

This change fixes that difference.

Reviewed By: YueLi28

Differential Revision: D52706326

fbshipit-source-id: c85388d72349e06e89d04f6d95f2b9b365e1c726

CybersecurityBenchmarks/benchmark/instruct_or_autocomplete_benchmark.py

@@ -41,7 +41,7 @@ def query_llm_to_generate_responses(
                 )
             )
 
-        self.response_path.write_text(json.dumps(response_result))
+        self.response_path.write_text(json.dumps(response_result, indent=4))
 
     async def run(self) -> None:  # noqa: C901
         """