Update `notification_service.py` (#21992)

* better check

* better check

---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

utils/notification_service.py

@@ -819,8 +819,8 @@ if __name__ == "__main__":
                 stacktraces = handle_stacktraces(artifact["failures_line"])
 
                 for line in artifact["summary_short"].split("\n"):
-                    if re.search("FAILED", line):
-                        line = line.replace("FAILED ", "")
+                    if line.startswith("FAILED "):
+                        line = line[len("FAILED ") :]
                         line = line.split()[0].replace("\n", "")
 
                         if artifact_path["gpu"] not in model_results[model]["failures"]:
@@ -910,8 +910,8 @@ if __name__ == "__main__":
 
             if failed:
                 for line in artifact["summary_short"].split("\n"):
-                    if re.search("FAILED", line):
-                        line = line.replace("FAILED ", "")
+                    if line.startswith("FAILED "):
+                        line = line[len("FAILED ") :]
                         line = line.split()[0].replace("\n", "")
 
                         if artifact_path["gpu"] not in additional_results[key]["failures"]: