[Training] SD3 training fixes (#8917)
* SD3 training fixes
Co-authored-by: bghira <59658056+bghira@users.noreply.github.com>
* rewrite noise addition part to respect the eqn.
* styler
* Update examples/dreambooth/README_sd3.md
Co-authored-by: Kashif Rasul <kashif.rasul@gmail.com>
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Co-authored-by: bghira <59658056+bghira@users.noreply.github.com>
Co-authored-by: Kashif Rasul <kashif.rasul@gmail.com>
