[`Mixtral` & `Mistral`] Add support for sdpa (#28133)
* some nits
* update test
* add support d\sd[a
* remove some dummy inputs
* all good
* style
* nits
* fixes
* fix more copies
* nits
* styling
* fix
* Update src/transformers/models/mistral/modeling_mistral.py
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
* add a slow test just to be sure
* fixup
---------
Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
