Shift Left: Build and test extension/llm/... buck packages packages whenever possible

[mergennachin]

We had a few reverts last week's oncall.

Having these in place would have prevented them.

Test Plan:

unittest-buck CI job

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14542

• 📄 Preview Python docs built from this PR

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❌ 5 New Failures, 5 Unrelated Failures

As of commit b1829c6 with merge base b3f3111 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (profiling) / build (gh)
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t 18fea5ab9bb18dd686b0e4ceb8fd1881a7e7a151872c6162228560ec9960f3b3 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t 951a977dce985f53eb17ebf9ea4dfbdcc6f8a5ab9c6b74e8d04efc095e9a79a4 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t c56eebfa31c42ae8c18e0d4e9a60ea97d297a7337b961b3d4f8fbfca59704964 /exec failed with exit code 1
• trunk / test-multimodal-macos (gemma3-4b) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 139

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following jobs failed but was present on the merge base:

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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[kimishpatel]

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