Close #8736: Added Campaign Option So Players Can Adjust The Base Target Number for StratCon Reinforcement Attempts

[IllianiBird]

Close #8736

As per title, defaults to 7 (the current value).

[codecov]

Codecov Report

❌ Patch coverage is 3.44828% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.20%. Comparing base (234164c) to head (caabcee).
⚠️ Report is 100 commits behind head on main.

Files with missing lines	Patch %	Lines
...ekhq/gui/campaignOptions/contents/RulesetsTab.java	0.00%	14 Missing ⚠️
...src/mekhq/gui/stratCon/StratConScenarioWizard.java	0.00%	7 Missing ⚠️
...ekhq/campaign/campaignOptions/CampaignOptions.java	25.00%	3 Missing ⚠️
...ign/campaignOptions/CampaignOptionsMarshaller.java	0.00%	2 Missing ⚠️
...n/campaignOptions/CampaignOptionsUnmarshaller.java	0.00%	1 Missing ⚠️
.../mekhq/campaign/stratCon/StratConRulesManager.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9102      +/-   ##
============================================
+ Coverage     15.18%   15.20%   +0.02%     
- Complexity     9305     9341      +36     
============================================
  Files          1305     1308       +3     
  Lines        173071   173541     +470     
  Branches      26146    26202      +56     
============================================
+ Hits          26278    26386     +108     
- Misses       143752   144076     +324     
- Partials       3041     3079      +38     

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