Add Logprobs unit test with a loose threshold (#10230)

Co-authored-by: Yusheng Su <yushengsu.thu@gmail.com>
Co-authored-by: Chayenne <zhaochen20@outlook.com>
Co-authored-by: Ryan <ryan@ryanmini.mynetworksettings.com>

test/srt/run_suite.py

@@ -81,6 +81,7 @@ suites = {
         TestFile("test_input_embeddings.py", 38),
         TestFile("test_io_struct.py", 8),
         TestFile("test_jinja_template_utils.py", 1),
+        TestFile("test_logprobs.py", 55),
         TestFile("test_metrics.py", 32),
         TestFile("test_metrics_utils.py", 1),
         TestFile("test_mla.py", 167),