[Core] Add FreeU to all the core pipelines and their (mostly-used) derivatives (#5376)
* add: freeu to the core sdxl pipeline.
* add: freeu to video2video
* add: freeu to the core SD pipelines.
* add: freeu to image variation for sdxl.
* add: freeu to SD ControlNet pipelines.
* add: freeu to SDXL controlnet pipelines.
* add: freu to t2i adapter pipelines.
* make fix-copies.