flux controlnet fix (control_modes batch & others) (#9507)
* flux controlnet mode to take into account batch size
* incorporate yiyixuxu's suggestions (cleaner logic) as well as clean up control mode handling for multi case
* fix
* fix use_guidance when controlnet is a multi and does not have config
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Co-authored-by: Christopher Beckham <christopher.j.beckham@gmail.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
