Refactored Kill Count and Personnel Filtering Methods

[IllianiCBT]

Updated the getIndividualKills method in KillAwards.java to use stream API for filtering mission kills. Improved the personnel filtering process in AutoAwardsController.java by combining all conditions into a single stream filter and removing the separate method for removing dependents and prisoners.

Closes #4408

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.27%. Comparing base (f7bd31c) to head (547e759).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4409   +/-   ##
=========================================
  Coverage     10.27%   10.27%           
  Complexity     5811     5811           
=========================================
  Files           925      925           
  Lines        126031   126024    -7     
  Branches      18627    18631    +4     
=========================================
  Hits          12945    12945           
+ Misses       111811   111804    -7     
  Partials       1275     1275           

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[kernhe]

Thanks a lot! Works now as expected.