refactor: move model trash to top-level .art/trash/<project>/models

Author: SyedaAnshrahGillani

src/art/model.py

@@ -364,8 +364,8 @@ async def train(
 
 
 def _get_trash_dir(project_name: str) -> str:
-    models_dir = get_models_dir(project_name)
-    return os.path.join(models_dir, ".trash")
+    art_path = get_default_art_path()
+    return os.path.join(art_path, "trash", project_name, "models")
 
 
 def move_to_trash(project_name: str, model_name: str):