Add model download to benchmark test

[kalantar]

Adds creation of PVC and model download to ci-pr-benchmark.yaml (kind cluster)

[kalantar]

download job seems to require a valid hf_token. when run locally, I see:

% k logs -f download-model-c4nnb
Collecting huggingface_hub
  Downloading huggingface_hub-0.34.4-py3-none-any.whl (561 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 561.5/561.5 kB 1.7 MB/s eta 0:00:00
Collecting packaging>=20.9
  Downloading packaging-25.0-py3-none-any.whl (66 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 66.5/66.5 kB 3.6 MB/s eta 0:00:00
Collecting typing-extensions>=3.7.4.3
  Downloading typing_extensions-4.15.0-py3-none-any.whl (44 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 44.6/44.6 kB 3.2 MB/s eta 0:00:00
Collecting pyyaml>=5.1
  Downloading PyYAML-6.0.2-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl (718 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 718.5/718.5 kB 2.7 MB/s eta 0:00:00
Collecting filelock
  Downloading filelock-3.19.1-py3-none-any.whl (15 kB)
Collecting tqdm>=4.42.1
  Downloading tqdm-4.67.1-py3-none-any.whl (78 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 78.5/78.5 kB 3.5 MB/s eta 0:00:00
Collecting hf-xet<2.0.0,>=1.1.3
  Downloading hf_xet-1.1.9-cp37-abi3-manylinux_2_28_aarch64.whl (3.1 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.1/3.1 MB 4.2 MB/s eta 0:00:00
Collecting fsspec>=2023.5.0
  Downloading fsspec-2025.7.0-py3-none-any.whl (199 kB)
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Collecting requests
  Downloading requests-2.32.5-py3-none-any.whl (64 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 64.7/64.7 kB 6.4 MB/s eta 0:00:00
Collecting certifi>=2017.4.17
  Downloading certifi-2025.8.3-py3-none-any.whl (161 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 161.2/161.2 kB 7.5 MB/s eta 0:00:00
Collecting urllib3<3,>=1.21.1
  Downloading urllib3-2.5.0-py3-none-any.whl (129 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 129.8/129.8 kB 7.9 MB/s eta 0:00:00
Collecting idna<4,>=2.5
  Downloading idna-3.10-py3-none-any.whl (70 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 70.4/70.4 kB 6.5 MB/s eta 0:00:00
Collecting charset_normalizer<4,>=2
  Downloading charset_normalizer-3.4.3-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl (147 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 147.2/147.2 kB 7.5 MB/s eta 0:00:00
Installing collected packages: urllib3, typing-extensions, tqdm, pyyaml, packaging, idna, hf-xet, fsspec, filelock, charset_normalizer, certifi, requests, huggingface_hub
Successfully installed certifi-2025.8.3 charset_normalizer-3.4.3 filelock-3.19.1 fsspec-2025.7.0 hf-xet-1.1.9 huggingface_hub-0.34.4 idna-3.10 packaging-25.0 pyyaml-6.0.2 requests-2.32.5 tqdm-4.67.1 typing-extensions-4.15.0 urllib3-2.5.0
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv

[notice] A new release of pip is available: 23.0.1 -> 25.2
[notice] To update, run: pip install --upgrade pip
The token has not been saved to the git credentials helper. Pass `add_to_git_credential=True` in this function directly or `--add-to-git-credential` if using via `hf`CLI if you want to set the git credential as well.
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/utils/_http.py", line 409, in hf_raise_for_status
    response.raise_for_status()
  File "/usr/local/lib/python3.10/site-packages/requests/models.py", line 1026, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 401 Client Error: Unauthorized for url: https://huggingface.co/api/whoami-v2

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/hf_api.py", line 1782, in whoami
    hf_raise_for_status(r)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/utils/_http.py", line 482, in hf_raise_for_status
    raise _format(HfHubHTTPError, str(e), response) from e
huggingface_hub.errors.HfHubHTTPError: 401 Client Error: Unauthorized for url: https://huggingface.co/api/whoami-v2 (Request ID: Root=1-68b6fb57-0d355525003ac66f3ec097f4;e2fc4c61-1a79-4445-9a2d-2e1aaa37c126)

Invalid credentials in Authorization header

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/bin/hf", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/cli/hf.py", line 59, in main
    service.run()
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/cli/auth.py", line 126, in run
    login(
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/utils/_deprecation.py", line 101, in inner_f
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/utils/_deprecation.py", line 31, in inner_f
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/_login.py", line 126, in login
    _login(token, add_to_git_credential=add_to_git_credential)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/_login.py", line 404, in _login
    token_info = whoami(token)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/utils/_validators.py", line 114, in _inner_fn
    return fn(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/huggingface_hub/hf_api.py", line 1796, in whoami
    raise HTTPError(error_message, request=e.request, response=e.response) from e
requests.exceptions.HTTPError: Invalid user token. The token from HF_TOKEN environment variable is invalid. Note that HF_TOKEN takes precedence over `hf auth login`.