Corrected Birthday Generation for Personnel

[IllianiCBT]

• Updated the birthday generation logic to ensure accurate age calculation based on experience level and affiliation.
• Constrained random date selection to always occur on or before the current campaign date.

This should address an edge case where under specific circumstances characters could generate with an age 1 year younger than intended.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.20%. Comparing base (fd739ba) to head (6aab372).
Report is 48 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5754      +/-   ##
============================================
- Coverage     10.21%   10.20%   -0.01%     
+ Complexity     6076     6073       -3     
============================================
  Files          1010     1010              
  Lines        139310   139312       +2     
  Branches      20448    20448              
============================================
- Hits          14231    14221      -10     
- Misses       123703   123720      +17     
+ Partials       1376     1371       -5     

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