[skip ci] remove unused code of timestr_to_int on benchmark (#10103)

Signed-off-by: wangting0128 <ting.wang@zilliz.com>

tests/benchmark/milvus_benchmark/utils.py

@@ -15,7 +15,7 @@ logger = logging.getLogger("milvus_benchmark.utils")
 
 def timestr_to_int(time_str):
     """ Parse the test time set in the yaml configuration file and convert it to int type """
-    time_int = 0
+    # time_int = 0
     if isinstance(time_str, int) or time_str.isdigit():
         time_int = int(time_str)
     elif time_str.endswith("s"):