Log Prohibited Unit Skips in Resupplies & Prevent Invalid Part Additions

[IllianiCBT]

• Added a log message to improve traceability when skipping prohibited units.
• Also ensured parts not in the existing parts list are excluded to prevent accidental additions to the pool.

Fix #5765

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.20%. Comparing base (fd739ba) to head (695e34d).
Report is 22 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5773      +/-   ##
============================================
- Coverage     10.21%   10.20%   -0.01%     
+ Complexity     6076     6071       -5     
============================================
  Files          1010     1010              
  Lines        139310   139313       +3     
  Branches      20448    20449       +1     
============================================
- Hits          14231    14221      -10     
- Misses       123703   123720      +17     
+ Partials       1376     1372       -4     

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