GROOVY-11913: Bring back SwingBuilder widgets list

[paulk-asert]

This PR creates the list using a script from a gradle task. We could alternately auto-generate the content but it changes so rarely, this seemed like a good solution.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.4985%. Comparing base (bc8bc7a) to head (c2956ff).

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2450        +/-   ##
==================================================
- Coverage     66.4994%   66.4985%   -0.0008%     
+ Complexity      30215      30214         -1     
==================================================
  Files            1408       1408                
  Lines          117744     117744                
  Branches        20907      20907                
==================================================
- Hits            78299      78298         -1     
  Misses          33020      33020                
- Partials         6425       6426         +1     

see 2 files with indirect coverage changes

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