[train_text_to_image_sdxl]Add LANCZOS as default interpolation mode for image resizing

[ParagEkbote]

What does this PR do?

Refs #11390

As mentioned in the issue, I've updated LANCZOS as the default interpolation mode for the training script. Please let me know if any modifications are required and I will make the necessary changes.

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Who can review?

@asomoza

[HuggingFaceDocBuilderDev]

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[asomoza]

thanks, just a minor correction

[asomoza]

thanks @ParagEkbote, as a final step, for contributing in diffusers you have to format the code, can you run these two commands on the console:

make style
make quality

If for some reason you can't run them, I can run a bot that does this for you, but it's always better to run it yourself, specially for larger contributions of code with multiple reviews.

[ParagEkbote]

I have run both the commands for code quality and linting. Could you please review the changes?

cc: @asomoza