Further Improvements to Cargo Container Checks; added Unit Tests

[IllianiCBT]

• Updated the cargo capacity logic to better account for destroyed locations and excluded unusable equipment.
• Introduced comprehensive unit tests to validate calculations across various scenarios, ensuring correctness and robustness.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.35%. Comparing base (e743e52) to head (5aa4de9).
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5954      +/-   ##
============================================
+ Coverage     10.28%   10.35%   +0.06%     
- Complexity     6122     6163      +41     
============================================
  Files          1039     1039              
  Lines        139358   139359       +1     
  Branches      20638    20639       +1     
============================================
+ Hits          14334    14428      +94     
+ Misses       123615   123503     -112     
- Partials       1409     1428      +19     

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[Sleet01]

LGTM