Add Strike mission to KA-50 and add appropriate payloads.

[zhexu14]

This PR addresses #1434 by adding the Strike mission to KA-50 (both playable variants) and adds appropriate default payloads.

#1434 requests DEAD mission type but that was already present.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.78%. Comparing base (d8ba7c7) to head (378d3ac).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3470      +/-   ##
===========================================
+ Coverage    47.75%   47.78%   +0.02%     
===========================================
  Files          476      411      -65     
  Lines        27185    26323     -862     
  Branches      4630     4486     -144     
===========================================
- Hits         12983    12578     -405     
+ Misses       14119    13662     -457     
  Partials        83       83              

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