print environment logs to std out.

ml-agents/tests/yamato/training_int_tests.py

         model_extension,
         "--mlagents-quit-after-seconds",
         str(model_override_timeout),
+        "--env-args",
+        "'-logfile -'",
     ]
     print(f"Starting inference with args {' '.join(args)}")
     res = subprocess.run(args, timeout=process_timeout)