refactor: remove Integraal::compute_error

[imrn99]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.66%. Comparing base (f405c5f) to head (e5532f2).
Report is 2 commits behind head on trunk.

Files	Patch %	Lines
integraal/src/structure/tests.rs	85.71%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            trunk      #28      +/-   ##
==========================================
+ Coverage   92.96%   94.66%   +1.70%     
==========================================
  Files           3        3              
  Lines         341      281      -60     
==========================================
- Hits          317      266      -51     
+ Misses         24       15       -9     

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