Update to reruns + timeouts in run_test.py (#100412)

https://github.com/pytorch/pytorch/pull/100200/files made unknown tests more likely to fail b/c lacking test times but still have time outs, so fix that
Pull Request resolved: #100412
Approved by: https://github.com/huydhn

test/run_test.py

@@ -547,7 +547,13 @@ def run_test(
 
     command = (launcher_cmd or []) + executable + argv
     should_file_rerun = "--subprocess" not in command and not RERUN_DISABLED_TESTS
-    timeout = THRESHOLD * 3 if should_file_rerun else None
+    timeout = (
+        THRESHOLD * 3
+        if should_file_rerun
+        and isinstance(test_module, ShardedTest)
+        and test_module.time is not None
+        else None
+    )
     print_to_stderr("Executing {} ... [{}]".format(command, datetime.now()))
 
     with open(log_path, "w") as f: