Add torch_xla and from_single_file to instruct-pix2pix (#10444)
* Add torch_xla and from_single_file to instruct-pix2pix
* StableDiffusionInstructPix2PixPipelineSingleFileSlowTests
* StableDiffusionInstructPix2PixPipelineSingleFileSlowTests
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: YiYi Xu <yixu310@gmail.com>