[executorch] Add program-data separation example to test files (#7887)

Pull Request resolved: https://github.com/pytorch/executorch/pull/7765

Add to test env to use for testing in next diff.
ghstack-source-id: 262611426
@exported-using-ghexport

Differential Revision: [D67376339](https://our.internmc.facebook.com/intern/diff/D67376339/)