[Tests] Improve transformers model test suite coverage - Latte (#8919)
* add LatteTransformer3DModel model test
* change patch_size to 1
* reduce req len
* reduce channel dims
* increase num_layers
* reduce dims further
* run make style
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Aryan <aryan@huggingface.co>