Updated Force Generation for Irregular Scenarios

[IllianiCBT]

Changed generation methods for Irregular scenarios. This should help reduce the difficulty of both. Irregular Force Assault should be roughly as challenging as other normal scenarios; whole Irregular Force Suppression should be a much easier experience (by design).

Closes #5219

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.51%. Comparing base (bce5f63) to head (4fab5d0).
Report is 40 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5224      +/-   ##
============================================
- Coverage     10.52%   10.51%   -0.01%     
+ Complexity     6047     6042       -5     
============================================
  Files           957      957              
  Lines        134523   134523              
  Branches      19545    19545              
============================================
- Hits          14154    14141      -13     
- Misses       119018   119028      +10     
- Partials       1351     1354       +3     

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