test: Implement fuzz tests for processors

[jescalada]

Fixes #1111, #694 (potentially).

Note that the actual impact on the OSSF score will be known after merging (may require another PR to fix if it doesn't increase automatically).

[netlify]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.29%. Comparing base (ddff723) to head (b28010a).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1115      +/-   ##
==========================================
+ Coverage   83.25%   83.29%   +0.04%     
==========================================
  Files          59       59              
  Lines        2449     2449              
  Branches      280      280              
==========================================
+ Hits         2039     2040       +1     
+ Misses        366      365       -1     
  Partials       44       44              

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[06kellyjac]

Looks good, just needs conflict resolution

[jescalada]

Thanks for the review @06kellyjac! I confirmed that the OSSF score went up from 8.0 to 8.5 - a full 10 points for the fuzzing section. 🎉