Fix llava half precision and autocast issues (#29721)
* Ensure input_embeds and image_features are the same dtype in autocast
* Fix nans in half precision llava-next and fix autocasting behavior.
* Fix styling issues.
* fix randn newline instantiation
* fix broken slow llava test
* Fix llava next init.
* fix styling issues
* [run-slow]llava,llava_next
* fix styling issues
