Revert "[data] Fix pandas import failures by moving it to a top-level…

… data import (ray-project#32447)" (ray-project#32533)

This reverts commit bc01288.

Signed-off-by: Edward Oakes <ed.nmi.oakes@gmail.com>

python/ray/data/__init__.py

@@ -1,7 +1,3 @@
-# Short term workaround for https://github.com/ray-project/ray/issues/32435
-# Datasets currently has a hard dependency on pandas, so it doesn't need to be delayed.
-import pandas  # noqa
-
 from ray.data._internal.compute import ActorPoolStrategy
 from ray.data._internal.progress_bar import set_progress_bars
 from ray.data.dataset import Dataset