Add CoreML BERT models to CI

[metascroy]

As titled

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13105

• 📄 Preview Python docs built from this PR

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❌ 3 New Failures, 3 Unrelated Failures

As of commit 3449226 with merge base 7750116 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2e800ba9c67d66d6dcfde4b0becdd228d0ec065005cc96a69b41425b9945e835 /exec failed with exit code 1
• trunk / test-arm-cortex-m-size-test (bare_metal) / linux-job (gh)
  RuntimeError: Command docker exec -t 84ba3d4fe104b9273a9a1e415308d36976f81c6ed7dc414e2338efacd44c6406 /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Apple / test-demo-ios / mobile-job (ios) (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-huggingface-transformers (google/gemma-3-1b-it) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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