Fix sensors example

[dfremont]

Description

Fixes the sensors example so that it works with pytest examples (I had forgotten to specify it needs to run in 2D mode), and adds better error messages if you try to run a driving domain scenario with sensors under a simulator that doesn't support them. I also removed the CARLA-specific version of the sensors example since it was nearly identical to the driving domain version, which works in CARLA anyway.

Issue Link

n/a

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

@lola831 could you please try the sensors example out in CARLA? I've tested it in MetaDrive and the Newtonian simulator (the latter triggering the new error message), but you can try those too.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.89%. Comparing base (94c55d8) to head (c46e5c5).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
- Coverage   90.01%   89.89%   -0.12%     
==========================================
  Files          54       54              
  Lines       13580    13578       -2     
==========================================
- Hits        12224    12206      -18     
- Misses       1356     1372      +16     

see 6 files with indirect coverage changes

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[lola831]

CI now passes with the latest changes. Also tested locally (including running the sensors example in CARLA).