Update on "Use generated files in module test"

Instead of checking in the PTE/PTD files. This helps us keep up to date with aot changes, especially with incoming flat_tensor refactor.

Main changes here are with the model. Instead of using AddModule from examples/portable, use ModuleAdd from test/models/export_program, like our other tests. There is a shape difference (1 tensor vs 2 tensors+alpha), so we have to change all the inputs.

Differential Revision: [D73470865](https://our.internmc.facebook.com/intern/diff/D73470865/)

[ghstack-poisoned]

Author: lucylq