revert changes in abstrat classed to fix Studio

Author: shcheklein

src/datachain/data_storage/metastore.py

@@ -97,8 +97,7 @@ def __enter__(self) -> "AbstractMetastore":
         return self
 
     def __exit__(self, exc_type, exc_value, traceback) -> None:
-        """Ensure cloned instances release DB resources when leaving contexts."""
-        self.close_on_exit()
+        """Default behavior is to do nothing, as connections may be shared."""
 
     @abstractmethod
     def clone(

src/datachain/data_storage/warehouse.py

@@ -71,8 +71,7 @@ def __enter__(self) -> "AbstractWarehouse":
         return self
 
     def __exit__(self, exc_type, exc_value, traceback) -> None:
-        # Release DB handles for clones used via context manager.
-        self.close_on_exit()
+        """Default behavior is to do nothing, as connections may be shared."""
 
     def cleanup_for_tests(self):
         """Cleanup for tests."""