Fix 6127: softlock during invalid Pointblank Shot

[Sleet01]

There were actually two issues in 6127:

1. Invalid units allowed to make Pointblank Shots against Aerospace units;
2. Skip Attack button had no event handler, did nothing whatsover in the PBS display.

This patch fixes both issues, so that only units that can make PBS attacks get the prompt, and the user can use the Skip Attacks button if they change their mind (or if an invalid unit somehow slips through and gets a PBS prompt).
Also fixes #6128, hidden units remaining hidden if they choose not to use PBS but would have been revealed, and implements fly-over side scanning for ASFs with Active Probes.

Testing:

• Manually tested PBS display and handling with A) illegal units, B) user choosing not to fire.
• Added unit tests for new Compute function
• Ran all 3 projects' unit tests

Close #6127
Close #6128
Implements ASF errata here: https://bg.battletech.com/forums/index.php?topic=84054.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.56%. Comparing base (9bf6d6e) to head (d42a4fb).
Report is 15 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6496      +/-   ##
============================================
+ Coverage     28.55%   28.56%   +0.01%     
- Complexity    14465    14494      +29     
============================================
  Files          2815     2815              
  Lines        277309   277355      +46     
  Branches      48973    48987      +14     
============================================
+ Hits          79175    79221      +46     
+ Misses       193434   193420      -14     
- Partials       4700     4714      +14     

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[Sleet01]

Converting to draft to pull in the fix for #6128 and update Aerospace spotting to match the errata.