fix: handles race condition on parallel config directory creation (#285)

In parallel runs of the regression tests, the compilation server might
fail when checking/loading the config file.

This change handles the specific case where those files are checked as
non existent, but when they attempting to create it, they would return
`FileExistsError`.

examples:
[1](https://github.com/CentML/playground/actions/runs/9601931045)
[2](https://github.com/CentML/playground/actions/runs/9601633511)

If you think this should be handled some other way, just let me know and
i'll make the change.

python/hidet/option.py

@@ -303,11 +303,8 @@ def register_hidet_options():
         description='The auth token to use for accessing private huggingface models.',
     )
 
-    config_file_path = os.path.join(os.path.expanduser('~'), '.config', 'hidet')
-    if not os.path.exists(config_file_path):
-        os.makedirs(config_file_path)
-    config_file_path = os.path.join(config_file_path, 'hidet.toml')
     # Load hidet config
+    config_file_path = os.path.join(os.path.expanduser('~'), '.config', 'hidet', 'hidet.toml')
     if os.path.exists(config_file_path):
         _load_config(config_file_path)