Remove untreated personnel nag for prisoner-defectors and add unit tests

[Algebro7]

This fixes the "untreated personnel" nag by having it exclude defectors. Illiani suggested making sure that bondsmen are also excluded, so I added unit tests to cover that as well as other cases. Note I had to make isUntreatedInjury() "package-private" instead of fully private in order to test it, but I don't think that should have any impact since only classes in the exact same package can access it.

Closes #4789

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.24%. Comparing base (4fa9b72) to head (f5083a8).
Report is 126 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4796      +/-   ##
============================================
+ Coverage     10.68%   11.24%   +0.56%     
- Complexity     5710     5941     +231     
============================================
  Files           950      950              
  Lines        131302   131306       +4     
  Branches      19135    19139       +4     
============================================
+ Hits          14025    14767     +742     
+ Misses       116052   115224     -828     
- Partials       1225     1315      +90     

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