What does this PR do?

Enabled fused_sdpa flash attention for starcoder2 model

Fixes # (issue)

Before submitting

[ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
[ ] Did you read the contributor guideline, Pull Request section?
[ ] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
[ ] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
[ ] Did you write any new necessary tests?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag members/contributors who may be interested in your PR.