Skip MetaDrive tests when assets cannot be downloaded

[lola831]

Description

MetaDrive needs to download an assets folder from a remote URL the first time it runs. On a local machine this usually happens once per virtual environment and is then cached. In CI, each run starts from a clean environment, so MetaDrive has to download the assets every time, and if that download fails, all of our MetaDrive tests fail.

This PR updates test_metadrive.py so that we explicitly call metadrive.pull_asset(update=False) before running any tests. If the asset download fails, we skip the entire MetaDrive test file instead of failing CI.

This keeps the MetaDrive tests from failing due to temporary download issues while still running them whenever the assets can be fetched successfully.

Issue Link

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.91%. Comparing base (e093379) to head (b032170).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
+ Coverage   89.86%   89.91%   +0.04%     
==========================================
  Files          54       54              
  Lines       13549    13556       +7     
==========================================
+ Hits        12176    12189      +13     
+ Misses       1373     1367       -6     

see 5 files with indirect coverage changes

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[dfremont]

Thanks, Lola!