Convert all non-rgb images to rgb

[vancoykendall]

@ebsmothers Ensure that all images are converted to RGB format. No longer need to separately convert grayscale images to rgb either. Addresses #1975

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1976

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[ebsmothers]

Thanks @vancoykendall for the fix! Once CI is green this is good to merge