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7a02fada - [scheduler] Support custom sigmas in UniPCMultistepScheduler (#12109)

[scheduler] Support custom sigmas in UniPCMultistepScheduler (#12109) * update * fix tests * Apply suggestions from code review * Revert default flow sigmas change so that tests relying on UniPC multistep still pass * Remove custom timesteps for UniPC multistep set_timesteps --------- Co-authored-by: YiYi Xu <yixu310@gmail.com> Co-authored-by: Daniel Gu <dgu8957@gmail.com> Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>