Issue 5979: Force players to use commit when deploying forces

[psikomonkie]

Fixes #5979

When deploying forces in Stratcon, the player should be required to hit "commit" on the 2nd deployment window before their primary forces are comitted. This ensures the objective is properly updated.

I also added another message to the 2nd deployment window to make it more clear, and a cancel button per Illiani's request:

(displaying this even if there's no leadership units is intentional - it's a chance for the player to realize they don't get any free leadership units and opt to deploy a different force).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.35%. Comparing base (fff3c87) to head (51cc8cf).
Report is 23 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6003      +/-   ##
============================================
+ Coverage     10.32%   10.35%   +0.02%     
- Complexity     6118     6141      +23     
============================================
  Files          1038     1038              
  Lines        139295   139326      +31     
  Branches      20662    20668       +6     
============================================
+ Hits          14389    14428      +39     
+ Misses       123466   123456      -10     
- Partials       1440     1442       +2     

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[psikomonkie]

In particular @IllianiCBT I wanted your thoughts on this line:

I haven't seen any issues with this in my testing. This should only be reachable during the initial deployment. isCommitForces should only return true if the user hit "Commit" on the 2nd deployment popup. So, if the user doesn't hit "commit" we're back where we started - nothing's deployed. It gets... Complicated if we instead try to delay deploying the initial force until after the 2nd deployment popup - a lot of the 2nd popup relies on a force already being deployed.

[IllianiCBT]

This all looks good to me. I'm going to approve and merge if but I'd like you to see if you can grab a volunteer or two to test it in tonight's nightly.