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a0acbdc9 - fix for #7365, prevent pipelines from overriding provided prompt embeds (#7926)

fix for #7365, prevent pipelines from overriding provided prompt embeds (#7926) * fix for #7365, prevent pipelines from overriding provided prompt embeds * fix-copies * fix implementation * update --------- Co-authored-by: bghira <bghira@users.github.com> Co-authored-by: Aryan <aryan@huggingface.co> Co-authored-by: sayakpaul <spsayakpaul@gmail.com>