Include xpia in handled_metrics for evaluation aggregation (#3727)

# Description

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### Testing Guidelines
- [ ] Pull request includes test coverage for the included changes.

src/promptflow-evals/promptflow/evals/_constants.py

@@ -19,6 +19,7 @@ class EvaluationMetrics:
     SELF_HARM = "self_harm"
     SEXUAL = "sexual"
     PROTECTED_MATERIAL = "protected_material"
+    INDIRECT_ATTACK = "indirect_attack"
 
 
 class _InternalEvaluationMetrics:

src/promptflow-evals/promptflow/evals/evaluate/_evaluate.py

@@ -92,6 +92,7 @@ def _aggregate_label_defect_metrics(df: pd.DataFrame) -> Tuple[List[str], Dict[s
     handled_metrics = [
         EvaluationMetrics.PROTECTED_MATERIAL,
         _InternalEvaluationMetrics.ECI,
+        EvaluationMetrics.INDIRECT_ATTACK,
     ]
     label_cols = []
     for col in df.columns: