fix response assertion in data modeling tests

[lpereiracgn]

Description

Update in the API response for errors is making the tests fail.

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.52%. Comparing base (13598ad) to head (f6feb8c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2150      +/-   ##
==========================================
- Coverage   90.53%   90.52%   -0.01%     
==========================================
  Files         158      158              
  Lines       23753    23753              
==========================================
- Hits        21504    21502       -2     
- Misses       2249     2251       +2     

see 1 file with indirect coverage changes

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[thorkildcognite]

risk review ok