Fix test_model.sh for vision text decoder

[jackzhxng]

Summary

Fixes test_model.sh missing TorchTune dependency.

Test plan

See if tests pass on this PR.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6874

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• [DomainsOnly] Jobs fail with GLIBC version not found

❌ 1 New Failure, 1 Cancelled Job

As of commit 10de320 with merge base eccc633 ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/xnnpack/test/ops/cat.py:

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

• trunk / test-models-macos (cmake, llama3_2_text_decoder, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[jackzhxng]

Merging, two errors (trunk / test-huggingface-transformers (google/gemma-2b) / linux-job (pull_request) and Lint / lintrunner / linux-job (pull_request)) are already broken