debug(benchmark): Add log statement to validator on TestResult

Validation errors don't mention the values causing the error, making it hard to debug. This happened a few times in autogpts-benchmark.yml, so let's put this log statement here until we figure out what makes it crash.

benchmark/agbenchmark/reports/processing/report_types.py

@@ -2,11 +2,13 @@
 Model definitions used internally and for reports generated during command-line runs.
 """
 
+import logging
 from typing import Any, Dict, List
 
 from pydantic import BaseModel, Field, constr, validator
 
 datetime_format = r"^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\+00:00$"
+logger = logging.getLogger(__name__)
 
 
 class TestResult(BaseModel):
@@ -27,6 +29,12 @@ class TestResult(BaseModel):
 
     @validator("fail_reason")
     def success_xor_fail_reason(cls, v: str | None, values: dict[str, Any]):
+        if bool(v) == bool(values["success"]):
+            logger.error(
+                "Error validating `success ^ fail_reason` on TestResult: "
+                f"success = {repr(values['success'])}; "
+                f"fail_reason = {repr(v)}"
+            )
         if v:
             success = values["success"]
             assert not success, "fail_reason must only be specified if success=False"