Update CoreML model testing in CI

[metascroy]

This PR updates the alpha/beta CoreML model testing in a few ways:

• All models are now testing with to_edge_lower_and_transform, the method we recommend in docs
• We run pybindings on exported models to ensure 1) they run, and 2) the output is similar to pytorch eager
• We add more model tests to CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12808

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[github-actions]

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[metascroy]

@digantdesai @cccclai can I get a stamp?

[mergennachin]

@metascroy have you seen this PR?

https://github.com/pytorch/executorch/pull/12371/files

What are your thoughts on consolidating? I can drop my PR but maybe you can take a look and see if there are things worth incorporating?

[metascroy]

@mergennachin I missed that PR, but I can incorporate the following changes from your PR here:

• Split CoreML/MPS into two separate jobs
• Merge the model lists from the two PRs

For the runtime checks, I'll proceed with the pybind testing I'm adding here (vs. the C++ runner checking in your PR) because with pybinding we also check model accuracy.

[mergennachin]

Thank you @metascroy

Changes look great