refactor: convert familiar training goals to enum

[midgleyc]

No description provided.

[codecov]

Codecov Report

Merging #1532 (81ccb9e) into main (fb850c1) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1532      +/-   ##
============================================
- Coverage     34.98%   34.98%   -0.01%     
  Complexity    17588    17588              
============================================
  Files          1067     1067              
  Lines        163601   163603       +2     
  Branches      34951    34947       -4     
============================================
- Hits          57233    57230       -3     
- Misses        96821    96825       +4     
- Partials       9547     9548       +1     

Impacted Files	Coverage Δ
...eforge/kolmafia/swingui/FamiliarTrainingFrame.java	0.00% <0.00%> (ø)
.../kolmafia/textui/command/TrainFamiliarCommand.java	16.66% <0.00%> (ø)
...sourceforge/kolmafia/textui/langserver/Script.java	81.91% <0.00%> (-3.20%)	⬇️

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