Close #9119: Added Dialog to Allow Mercenary & Pirate Players to Better Control Starting Location

[IllianiBird]

Close #9119

Another piece of QoL for our player base.

Currently, we always start these campaigns in a semi-random location.

Now mercenary & pirate players can choose whether to start on their faction's capital or a semi-random location.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.21%. Comparing base (f2bf383) to head (81d3c31).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...q/gui/dialog/StartingSystemConfirmationDialog.java	0.00%	28 Missing ⚠️
MekHQ/src/mekhq/campaign/Campaign.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #9122   +/-   ##
=========================================
  Coverage     15.20%   15.21%           
- Complexity     9335     9339    +4     
=========================================
  Files          1311     1312    +1     
  Lines        173407   173435   +28     
  Branches      26220    26224    +4     
=========================================
+ Hits          26372    26387   +15     
- Misses       143957   143975   +18     
+ Partials       3078     3073    -5     

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[Sleet01]

LGTM