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a5720e9e - [PixArt-Alpha] Fix PixArt-Alpha pipeline when number of images to generate is more than 1 (#5752)

[PixArt-Alpha] Fix PixArt-Alpha pipeline when number of images to generate is more than 1 (#5752) * does this fix things? * attention mask use * attention mask order * better masking. * add: tesrt * remove mask_featur * test * debug * fix: tests * deprecate mask_feature * add deprecation test * add slow test * add print statements to retrieve the assertion values. * fix for the 1024 fast tes * fix tesy * fix the remaining * Apply suggestions from code review * more debug --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>