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 66.4965%. Comparing base (bc8bc7a) to head (d09ed7f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2450        +/-   ##
==================================================
- Coverage     66.4994%   66.4965%   -0.0028%     
- Complexity      30215      30216         +1     
==================================================
  Files            1408       1408                
  Lines          117744     117746         +2     
  Branches        20907      20907                
==================================================
- Hits            78299      78297         -2     
- Misses          33020      33022         +2     
- Partials         6425       6427         +2     

see 3 files with indirect coverage changes

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