[Flux Dreambooth LoRA] - te bug fixes & updates (#9139)
* add requirements + fix link to bghira's guide
* text ecnoder training fixes
* text encoder training fixes
* text encoder training fixes
* text encoder training fixes
* style
* add tests
* fix encode_prompt call
* style
* unpack_latents test
* fix lora saving
* remove default val for max_sequenece_length in encode_prompt
* remove default val for max_sequenece_length in encode_prompt
* style
* testing
* style
* testing
* testing
* style
* fix sizing issue
* style
* revert scaling
* style
* style
* scaling test
* style
* scaling test
* remove model pred operation left from pre-conditioning
* remove model pred operation left from pre-conditioning
* fix trainable params
* remove te2 from casting
* transformer to accelerator
* remove prints
* empty commit
