--use-pt-pinned-commit in one-off linux jobs

* --use-pt-pinned-commit in one-off linux jobs

Pull Request resolved: https://github.com/pytorch/executorch/pull/7922

This is needed to respect the torchgen pinned commit for #7546.
ghstack-source-id: 263542478
@exported-using-ghexport

Differential Revision: [D68593517](https://our.internmc.facebook.com/intern/diff/D68593517/)

* use-pt-pinned-commit for test-arm-{backend,reference}-delegation (#8023)

Pull Request resolved: https://github.com/pytorch/executorch/pull/7579

Without this, these builds don't respect the torchgen pinned commit and thus fail with #7546.
ghstack-source-id: 263542481
@exported-using-ghexport

Differential Revision: [D67996459](https://our.internmc.facebook.com/intern/diff/D67996459/)

Co-authored-by: Scott Wolchok <swolchok@meta.com>

---------

Co-authored-by: Scott Wolchok <swolchok@meta.com>