Add nfsstore bandwidth testing script

Author: zhou-haitao

ucm/store/test/e2e/nfsstore_embed_fetch.py

@@ -174,7 +174,7 @@ def main():
         num_head_list = [1, 2, 4]
 
     SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
-    csv_file = os.path.join(SCRIPT_DIR, "embed_fetch_result1.csv")
+    csv_file = os.path.join(SCRIPT_DIR, "embed_fetch_result.csv")
     need_header = not os.path.exists(csv_file)
 
     with open(csv_file, "a", newline="", encoding="utf-8") as csv_fp: