[wan2.2] add 5b i2v (#12006)
* add 5b ti2v
* remove a copy
* Update src/diffusers/pipelines/wan/pipeline_wan_i2v.py
Co-authored-by: Aryan <aryan@huggingface.co>
* Apply suggestions from code review
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Co-authored-by: Aryan <aryan@huggingface.co>
