[Bug] Fix QwenImageEditPlus Series on NPU (#13017)
* [Bug Fix][Qwen-Image-Edit] Fix Qwen-Image-Edit series on NPU
* Enhance NPU attention handling by converting attention mask to boolean and refining mask checks.
* Refine attention mask handling in NPU attention function to improve validation and conversion logic.
* Clean Code
* Refine attention mask processing in NPU attention functions to enhance performance and validation.
* Remove item() ops on npu fa backend.
* Reuse NPU attention mask by `_maybe_modify_attn_mask_npu`
* Apply style fixes
* Update src/diffusers/models/attention_dispatch.py
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Co-authored-by: zhangtao <zhangtao529@huawei.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>
