LTX Video 0.9.7 (#11516)
* add upsampling pipeline
* ltx upsample pipeline conversion; pipeline fixes
* make fix-copies
* remove print
* add vae convenience methods
* update
* add tests
* support denoising strength for upscaling & video-to-video
* update docs
* update doc checkpoints
* update docs
* fix
---------
Co-authored-by: Linoy Tsaban <57615435+linoytsaban@users.noreply.github.com>
