[Fg3] Refactored Difficulty Multiplier Application

[IllianiCBT]

Moved difficulty multiplier application exclusively to enemy forces. Previously it was being applied to both player and enemy forces. This meant that, if the player was playing with a low difficulty, their allies would have their force budgets slashed.

I also did a couple of minor reporting changes. Nothing of note.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.53%. Comparing base (fb6c52a) to head (cbff0b0).
Report is 32 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5145   +/-   ##
=========================================
  Coverage     10.53%   10.53%           
- Complexity     6041     6046    +5     
=========================================
  Files           956      956           
  Lines        134253   134263   +10     
  Branches      19501    19505    +4     
=========================================
+ Hits          14142    14151    +9     
+ Misses       118760   118757    -3     
- Partials       1351     1355    +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.