♻️ Fix empty_config context manager

The `empty_config` context manager is used for some of the testing infrastructure
of the installation commands. It relied on some methods for adapting the
AiiDA configuration folder, whose API has been changed in

aiidateam/aiida-core@9baf3ca

Here we adapt the context manager to rely on the new API using the `AiiDAConfigDir`.

Author: mbercx

tests/cli/test_install.py

@@ -29,7 +29,7 @@ def empty_config() -> Config:
     from aiida.manage.configuration import settings
 
     current_config = configuration.CONFIG
-    current_config_path = current_config.dirpath
+    current_config_path = pathlib.Path(current_config.dirpath)
     current_profile = configuration.get_profile()
     current_path_variable = os.environ.get(settings.DEFAULT_AIIDA_PATH_VARIABLE, None)
 
@@ -39,8 +39,7 @@ def empty_config() -> Config:
     with tempfile.TemporaryDirectory() as dirpath:
         dirpath_config = pathlib.Path(dirpath) / 'config'
         os.environ[settings.DEFAULT_AIIDA_PATH_VARIABLE] = str(dirpath_config)
-        settings.AIIDA_CONFIG_FOLDER = str(dirpath_config)
-        settings.set_configuration_directory()
+        settings.AiiDAConfigDir.set(dirpath_config)
         configuration.CONFIG = configuration.load_config(create=True)
 
         try:
@@ -51,8 +50,7 @@ def empty_config() -> Config:
             else:
                 os.environ[settings.DEFAULT_AIIDA_PATH_VARIABLE] = current_path_variable
 
-            settings.AIIDA_CONFIG_FOLDER = current_config_path
-            settings.set_configuration_directory()
+            settings.AiiDAConfigDir.set(current_config_path)
             configuration.CONFIG = current_config
 
             if current_profile: