Remove deuplicated test.

Author: michaelsafyan

instrumentation-genai/opentelemetry-instrumentation-google-genai/tests/utils/test_dict_util.py

@@ -219,18 +219,6 @@ def test_converts_tuple_with_json_fallback():
     }
 
 
-def test_converts_tuple_with_json_fallback():
-    input_dict = {
-        "foo": ("abc", 123),
-    }
-    output = dict_util.flatten_dict(input_dict)
-    assert output == {
-        "foo.length": 2,
-        "foo[0]": "abc",
-        "foo[1]": 123,
-    }
-
-
 def test_json_conversion_handles_unicode():
     input_dict = {
         "foo": ("❤️", 123),