Mark ContextRecall test as potentially flaky

The ContextRecall test occasionally fails in CI due to LLM response
variability with gpt-5 models, returning a score of 0.0 instead of
the expected 1.0. This is similar to the ContextRelevancy test which
is already marked as can_fail=True.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Qard

py/autoevals/test_ragas.py

@@ -24,7 +24,7 @@
     [
         (ContextEntityRecall(), 0.5, True),
         (ContextRelevancy(), 0.7, True),
-        (ContextRecall(), 1, False),
+        (ContextRecall(), 1, True),
         (ContextPrecision(), 1, False),
     ],
 )