Enable quantizing local checkpoints in model release script

[jerryzh168]

Summary:
For torchao model release scripts, previously we only support quantizing models downloaded from hf directly (with a model id), this PR turns it off by default and allows users to quantize a local checkpoint

Test Plan:
cd .github/scripts/torchao_model_releases/
./release.sh --model_id $LOCAL_MODEL_PATH --quants FP8

Reviewers:

Subscribers:

Tasks:

Tags:

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2859

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit 0dd5d77 with merge base 27f4d75 ():

NEW FAILURE - The following job has failed:

• Run TorchAO Experimental Tests / test-cpu-ops (macos-14) (gh)
  Process completed with exit code 1.

CANCELLED JOB - The following job was cancelled. Please retry:

• Run TorchAO Experimental Tests / test-cpu-ops (linux.arm64.2xlarge) (gh)

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

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

• Run Regression Tests / test (CUDA 2.8, linux.g5.12xlarge.nvidia.gpu, torch==2.8.0, cuda, 12.6) / linux-job (gh) (trunk failure)
  test/integration/test_integration.py::TestAutoQuant::test_autoquant_hp_float

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