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* fix: preserve boolean dtype for attention masks in ChromaPipeline

- Convert attention masks to bool and prevent dtype corruption
- Fix both positive and negative mask handling in _get_t5_prompt_embeds
- Remove float conversion in _prepare_attention_mask method

Fixes #12116

* test: add ChromaPipeline attention mask dtype tests

* test: add slow ChromaPipeline attention mask tests

* chore: removed comments

* refactor: removing redundant type conversion

* Remove dedicated dtype tests as per  feedback

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Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>