[CI][RFC] Replace black-jupyter with ruff-format (#37210)

Co-authored-by: Alison Shao <a.shao@wustl.edu>

test/registered/function_call/test_kimik2_detector.py

@@ -309,7 +309,7 @@ class TestKimiK2DetectorSpecialTokenLeakage(unittest.TestCase):
     def test_no_leak_on_error_fallback(self):
         """On parse errors, normal_text fallback has tokens stripped."""
         cleaned = _strip_special_tokens(
-            "leaked<|tool_calls_section_begin|>" "<|tool_call_end|>content"
+            "leaked<|tool_calls_section_begin|><|tool_call_end|>content"
         )
         self.assertEqual(cleaned, "leakedcontent")
 
@@ -992,7 +992,7 @@ class TestKimiK2EndToEnd(unittest.TestCase):
                 "<|tool_call_begin|>functions.get_weather:1"
                 f'<|tool_call_argument_begin|>{{"city":',
                 ' "Bad", "valid": fasle',
-                "<|tool_call_end|>" "<|tool_calls_section_end|>" + good_section_1,
+                "<|tool_call_end|><|tool_calls_section_end|>" + good_section_1,
             ],
         }