[tests] Add additional tests and clean up missing parts

[felixdittrich92]

This PR:

• Remove unused Resize & Preprocessor logic
• Add additional Resize tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.51%. Comparing base (a054bda) to head (74d29f0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1982      +/-   ##
==========================================
+ Coverage   96.38%   96.51%   +0.12%     
==========================================
  Files         141      141              
  Lines        6037     6025      -12     
==========================================
- Hits         5819     5815       -4     
+ Misses        218      210       -8     

Flag	Coverage Δ
unittests	96.51% <100.00%> (+0.12%)	⬆️

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