For zarr based dataloader, enable upperclip() to remove outlier pixel intensities.

[ashesh-0]

For .tiff based dataloader, it is enabled on a dataset level (https://github.com/juglab/uSplit/blob/main/usplit/data_loader/multi_channel_determ_tiff_dloader.py#L164). For .zarr, we need to do this at patch level.