Make HQQ default PTQ quantization in ExecuTorch

[metascroy]

Differential Revision: D84020605

Pull Request resolved: #14834

(cherry picked from commit d39992f)

Summary

This is a cherry pick of #14834.

The bot failed due to merge conflict, which I fixed manually.

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14979

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❌ 1 New Failure, 4 Cancelled Jobs, 1 Unrelated Failure

As of commit 720cbe2 with merge base e0dda90 ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 0ff644f148e37f938efca9a1d7f56d440ffa1e2272de96edf72c859b2fddae00 /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / unittest / macos / macos-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos-coreml (mv3) / macos-job (gh)
• trunk / unittest-release / macos / macos-job (gh)
  ##[error]The operation was canceled.

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

• pull / test-eval_llama-wikitext-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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